I could have sworn that 2 days ago when I entered (-x)^2 i got x. Now when I enter the same thing I get 100. How do I fix this?

Hello,

I do not know how you could have obtained the first result: The only possibility is that your X has been assigned a value of 1. Even if it was the case, the calculculator shown on the left (TI83PLUS SILVER Edition) does not do symbolic algebra.

For the second case, I suspect some way or other, the variable X store a value of 10. When you enter (-X)^2 the calculator retrieves the value stored in the variable X and performs the calculation, which does yield 100.

Note: to store a value in one of the 26 variables (letters) you proceed as follow

10 STO-> ALPHA X

The screen displays 10->X

When you press ENTER it displays 10.0..

To recall a value stored in the X variable you type

2ND RCL ALPHA X.

Hope it clarifies the question.

Posted on Aug 20, 2009

The position of the exponent in trig functions is an anomaly in mathematical notation. While the square of sin x is commonly written as

sin^2(x) ,

the square of any other function is written as f(x) ^2 . For example, you wouldn't write ln^2(2) if you mean the square of the natural logarithm of 2, instead you write it as ln(2)^2 or (ln(2))^2 .

The calculator works the same way. To calculate the square of the sine of 3, for example, press

SIN 3 ) ^ 2 ENTER

sin^2(x) ,

the square of any other function is written as f(x) ^2 . For example, you wouldn't write ln^2(2) if you mean the square of the natural logarithm of 2, instead you write it as ln(2)^2 or (ln(2))^2 .

The calculator works the same way. To calculate the square of the sine of 3, for example, press

SIN 3 ) ^ 2 ENTER

Nov 18, 2011 | Texas Instruments Calculators

No, you're not squaring a negative number, you're negating a square. When you press (-) 4 ^ 2 ENTER , the calculator is calculating -(4^2). 4^2 is 16, and the negative of that is -16. What you want to do is to calculate (-4)^2 by pressing ( (-) 4 ) ^ 2 ENTER .

Jul 11, 2011 | Texas Instruments TI-83 Plus Calculator

Option 1: Find the button that looks like "" and then type "110.5" in the parenthesis. Hit enter.

Visual: ?(110.5)

Option 2: Set "110.5" to the "1/2" using the " ^ " button. Hit enter.

Visual: 110.5 ^ (1/2)

Visual: ?(110.5)

Option 2: Set "110.5" to the "1/2" using the " ^ " button. Hit enter.

Visual: 110.5 ^ (1/2)

Mar 15, 2011 | Texas Instruments TI-30XA Calculator

If you're pressing the keys

(-) 1 0 5 ^ 2 ENTER

then you're not squaring a negative number, you're negating a square. This sequence of keystrokes calculates -(105^2), and -11025 is the correct answer for this.

Since the ^ operator binds more tightly than the (-) operator, you need to tell the calculator you want to override the order of operations, just as you would if you wanted an addition done before a multiplication. Press

( (-) 1 0 5 ) ^ 2 ENTER and you will see the expected result.

(-) 1 0 5 ^ 2 ENTER

then you're not squaring a negative number, you're negating a square. This sequence of keystrokes calculates -(105^2), and -11025 is the correct answer for this.

Since the ^ operator binds more tightly than the (-) operator, you need to tell the calculator you want to override the order of operations, just as you would if you wanted an addition done before a multiplication. Press

( (-) 1 0 5 ) ^ 2 ENTER and you will see the expected result.

Jan 23, 2011 | Texas Instruments TI-83 Plus Calculator

Yes, your Ti 86 should solve square root problems. At the HOME screen press [CLEAR] [2nd] [x^2] which gives the (Square Root Symbol) to display at the Home screen. Then enter the number you want the square root of and close the bracket [ ) ] and, press the [ENTER] key.

You can even get the square root of complex numbers too. Select the correct complex format in the mode settings. For example: I'll do one in the rectangular form by enter a number as (a, b). I then will go to [2nd] [MODE] then [Arrow down] 3 times and make sure the RectC is highlighted and selected. Then quit out of the mode settings screen and enter [CLEAR] [2nd] [x^2] [ ( ] [9] [ , ] [ - ] [4] [ ) ] [ ) ] [ENTER], this displays the SQRT((9,-4)) equals (3, 2); The real part is 3 and the imaginary part 2.

You can even get the square root of complex numbers too. Select the correct complex format in the mode settings. For example: I'll do one in the rectangular form by enter a number as (a, b). I then will go to [2nd] [MODE] then [Arrow down] 3 times and make sure the RectC is highlighted and selected. Then quit out of the mode settings screen and enter [CLEAR] [2nd] [x^2] [ ( ] [9] [ , ] [ - ] [4] [ ) ] [ ) ] [ENTER], this displays the SQRT((9,-4)) equals (3, 2); The real part is 3 and the imaginary part 2.

Jan 09, 2011 | Texas Instruments TI-86 Calculator

Use parentheses. If you enter (-) 2 x^2, you're not squaring negative-two, but getting the negative of two-squared because the square operation binds tighter than negation. Enter the expression as ( (-) 2 ) x^2 to square negative-two.

Nov 17, 2010 | Texas Instruments TI-30X-IISTK Scientific...

Usually you do not use the prefix micro by itself, it must be followed by the name of a unit: 1 micrometer=10^-6 meter. This being said, you want to enter 100*10^-6 and raise it to power 2.

For this you can use the exponent rules.

In what follows, I will enter (10^-6)* 100 and square it. I will use the change sign (-) or [+/-] key

(-6) [2nd][10 to x] [*] 100 [=] [x^2] [=]

The first = calculates 100*10^(-6), the second [=] calculates the square of the number obtained after the first [=].

There are other ways that use parentheses to avoid ambiguities, but I think this is the safest one for you. Be warned that the result will most likely be displayed in scientific format, 1.00 -08 where the -08 will be raised with respect to the main level line. If not, the result will be 0.00000001

For this you can use the exponent rules.

- 100*10^-6=(10^2)*(10^-6)=10^(2-6)=10^-4; product of powers =>algebraic sum pf exponents
- (10^-4)^2=10^(-4*2) =10^(-8) ; power of power =>product of exponents.

In what follows, I will enter (10^-6)* 100 and square it. I will use the change sign (-) or [+/-] key

(-6) [2nd][10 to x] [*] 100 [=] [x^2] [=]

The first = calculates 100*10^(-6), the second [=] calculates the square of the number obtained after the first [=].

There are other ways that use parentheses to avoid ambiguities, but I think this is the safest one for you. Be warned that the result will most likely be displayed in scientific format, 1.00 -08 where the -08 will be raised with respect to the main level line. If not, the result will be 0.00000001

Feb 17, 2010 | Texas Instruments TI-30XA Calculator

Enclose any negative number between parentheses before squaring.

If you enter -4^2, where - is the negation, the result will be -16 because of the priority rules: exponentiation (power) has priority over negation.

If you enter (-4)^2 the result will be 16, because parentheses have priority over the squaring: the 4 is negated then the result is squared.

If you enter -4^2, where - is the negation, the result will be -16 because of the priority rules: exponentiation (power) has priority over negation.

If you enter (-4)^2 the result will be 16, because parentheses have priority over the squaring: the 4 is negated then the result is squared.

Dec 30, 2009 | Casio FX-300MS Calculator

If you want the answer in rectangular form, set MODE a+bi and tap ENTER and QUIT. Tap square root sign, tap (-)4 and close the parenthesis and tap ENTER. The answer is shown as 2i.

If you want the answer in polar form, set MODE to re^xi and and DEGREE. Tap ENTER and QUIT. Tap the square root sign, tap (-)4, close the parenthesis, and tap ENTER. The answer shown is 2e^90i. (2 at ninety degrees). If you selected RADIAN mode, the answer would be 2e^1.57i (2 at 1.57 radians; or 2 at pi/2 radians)

If you want the answer in polar form, set MODE to re^xi and and DEGREE. Tap ENTER and QUIT. Tap the square root sign, tap (-)4, close the parenthesis, and tap ENTER. The answer shown is 2e^90i. (2 at ninety degrees). If you selected RADIAN mode, the answer would be 2e^1.57i (2 at 1.57 radians; or 2 at pi/2 radians)

Mar 09, 2009 | Texas Instruments TI-86 Calculator

Hello,

The square root has a dedicated key sequence [2nd][V square root symbol]

Square root of 21.2846 is entered [2nd][V square root] 21.2846 [ENTER] .

The result is`4.614.

I suspect you want to calculate the 4th root of 21.2846. If it is the case you enter that as

21.2846 [^](1/4) =2.148

Square root can be also entered as [^](1/2)

Cube root is entered as [^] (1/3)

..

nth root is entered as [^](1/n)

Hope it helps.

The square root has a dedicated key sequence [2nd][V square root symbol]

Square root of 21.2846 is entered [2nd][V square root] 21.2846 [ENTER] .

The result is`4.614.

I suspect you want to calculate the 4th root of 21.2846. If it is the case you enter that as

21.2846 [^](1/4) =2.148

Square root can be also entered as [^](1/2)

Cube root is entered as [^] (1/3)

..

nth root is entered as [^](1/n)

Hope it helps.

Nov 19, 2008 | Texas Instruments TI-86 Calculator

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