Question about Texas Instruments TI-30XA Calculator

How to convert square roots?

Ad

Unfortunately this calculator does not display results in radical form. If you enter SQRT(147) you get 12.12435565...

What you are asking for is called **rationalizing** an irrational expression. Usually one tries to get rid of radicals that appear in the denominators. Here is an example.

Suppose you have 1/(c+SQRT(d)), and you want to get rid of the radical in the denominator. How to do it?

Recall the identity ** (a-b)*(a+b)= a^2-b^2**. It is true for any **a** and **b **

**Rationalizing a denominator** (usual case)

Now consider (c+SQRT(d)). Multiply it by (c-SQRT(d))

[c+SQRT(d)]*[c-SQRT(d)]=c^2 -[SQRT(d)]^2=**c^2-d**

You see that there is no radical.

Now take **1/(c+SQRT(d))**. To get rid of the radical from the denominator multiply it by (c-SQRT(d)). But to leave the value of your expression ** 1/(c+SQRT(d))** unchanged, you must multiply both numerator and denominator by (c-SQRT(d)).

The numerator becomes 1*(c-SQRT(d))=**c-SQRT(d)**, and the denominator **(c^2-d)**.

Finally, the rationalized form of the expression **1/(c+SQRT(d))** is

[**c-SQRT(d)**]**/[c^2-d]**.

**Rationalizing a numerator**

Sometimes, people have a radical in the numerator that they want to get rid of and have it in the denominator. The procedure is the same

Example:**(c+SQRT(d))**, the denominator here is 1

**(c+SQRT(d))**=(c+SQRT(d))*[c-SQRT(d)]/[c-SQRT(d)]. This gives

**[c^2-d]/[c-SQRT(d)]**

You have no radical in the numerator but there is one in the denominator. This is called rationalizing the numerator.

Your case is a lot simpler

SQRT(147)=7*SQRT(3)

Multiply it by SQRT(3)/SQRT(3) which is 1. This gives

SQRT(147)=7*3/SQRT(3)=21/SQRT(3)

**SQRT(147)= 21/SQRT(3)**

Posted on Feb 09, 2014

Ad

Hi,

a 6ya expert can help you resolve that issue over the phone in a minute or two.

Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.

the service is completely free and covers almost anything you can think of.(from cars to computers, handyman, and even drones)

click here to download the app (for users in the US for now) and get all the help you need.

Goodluck!

Posted on Jan 02, 2017

Ad

SOURCE: square roots

One way is you get square root by raising to the (1/2) power. For example square root of 16 is

16^(1/2).

You can use this method to get the other "roots" as well e.g. 1/3, 1/4, etc.

Posted on Apr 18, 2009

SOURCE: TI-15 square root Function

Hello,

You should enter it as follows [SQRT]36 ) [ENTER/=].

If you define some function f of a variable x you write that f(x), where the parentheses enclose the so-called argument (objet on wich the function acts). It seems that on this calculator the opening parenthesis is implicit: the calculator supplies it when you press [SQRT] but does not display it (a design flaw?). However the closing parenthesis must be entered by you to signifie to the function [SQRT] that you have finished entering the argument. Weird but one can live with it.

Hope it helps.

Posted on Sep 07, 2009

SOURCE: how do you tak the square root of 64 or the 4 root of any other #

Hi shiny_diamon

Here is a picture of the powers and root functions of your calculator.

1.To calculate the cubic root of a number you use the key combination shown on line 5

Ex: Cubic root of 27

27 [2nd] [3 root x] [EXE]; Should get 3

2. You can use the general root key on line 7 [2nd][x Root y]

Ex: Cubic root of 125

125 [2nd][ x Root y] 3 [EXE] Should get 5

(-125) [2nd][x Root y] 3 [EXE]; Should get -5

3. You can also yse the general power key on line 6: [Y to x], but the degree of the root is entered as a fraction 1/3

Ex: cubic root of -125.

(-125) [Y to x]( 1/3) [EXE]; You should get -5**4. The [Y to x[ key is the one you use to obtain all other roots fourth, fift, tenth, n-th.**

Ex: Fourth root of 256

256 [Y to x] (1/4) [EXE]: You should get 4

5. To extract the squqre root of a number you can use the key on the 3rd line [root x] or the general power key on line 6 with exponent 1/2

Exemple square root of 256

256 [Root x] [EXE] should give you 16

256 [Y to x] (1/2) [EXE] should give you 16 also

Hope that helps.

Posted on Nov 08, 2009

SOURCE: How do you use the imaginary number with the TI-84 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)

Posted on Dec 20, 2009

If, for example, you're getting the square root of 3 as the square root of 3, press the S-D button (just above the DEL) button to convert the symbolic result to a decimal result.

If you want all results to come up in decimal, press SHIFT SETUP 2 to select the LineIO mode.

If you want all results to come up in decimal, press SHIFT SETUP 2 to select the LineIO mode.

Feb 03, 2015 | Casio fx-115ES Plus Scientific Calculator

You can use the square-root function for any number, whether it's a perfect square or not. For example, to calculate the square root of 2, press SHIFT [square-root] 2 EXE .

[square-root] is on the x^2 key, just to the right of the ALPHA key.

[square-root] is on the x^2 key, just to the right of the ALPHA key.

Jan 17, 2013 | Casio FX-9860GII Graphing Calculator With...

Press 2nd [square-root], enter the number, press ) =

For example, to calculate the square root of 5, press 2nd [square-root] 5 ) =

For example, to calculate the square root of 5, press 2nd [square-root] 5 ) =

May 07, 2011 | Texas Instruments TI-30 XIIS Calculator

To calculate the square root of 9, press

2nd [square-root] 9 ) =

The square-root is the shifted function of the x-squared key, just to the left of the 7 key. The close-parenthesis is needed to balance the open-parenthesis automatically inserted by the square-root function.

2nd [square-root] 9 ) =

The square-root is the shifted function of the x-squared key, just to the left of the 7 key. The close-parenthesis is needed to balance the open-parenthesis automatically inserted by the square-root function.

Feb 16, 2011 | Texas Instruments TI-30 XIIS Calculator

Two ways:

2ND [square-root] ( 8 7 . 3 4 / 5 ) ENTER

8 7 . 3 4 / 5 ENTER then 2ND [square-root] 2ND ANS ENTER

The first sequence takes the square root of 87.34/5, the second sequence calculates 87.34/5 then takes the square root of the result.

2ND [square-root] ( 8 7 . 3 4 / 5 ) ENTER

8 7 . 3 4 / 5 ENTER then 2ND [square-root] 2ND ANS ENTER

The first sequence takes the square root of 87.34/5, the second sequence calculates 87.34/5 then takes the square root of the result.

Dec 15, 2010 | Texas Instruments TI-84 Plus Calculator

Use the square-root function, which is the shifted function of the x^2 key just to the left of the 7 key.

For example, to find the square root of 2, press 2nd [square-root] 2 ) =

For example, to find the square root of 2, press 2nd [square-root] 2 ) =

Nov 23, 2010 | Texas Instruments TI-30 XIIS Calculator

The square root of a negative number is an imaginary number, and the TI-30XA does not deal with imaginary numbers.

However, the square root of -x is equal to i times the square root of x. So, to calculate the square root of -4, for example, press 4 square_root = and read 2. Thus the square root of -4 is 2i.

However, the square root of -x is equal to i times the square root of x. So, to calculate the square root of -4, for example, press 4 square_root = and read 2. Thus the square root of -4 is 2i.

Oct 07, 2010 | Texas Instruments TI-30XA Calculator

For square roots, use the square root key just to the left of the divide key. For example, 4 square-root = will give you 2.

The calculator doesn't have any way to store equations, scientific or otherwise. If you mean scientific notation, use the EE key just above the 7 key to enter exponents. For example, to enter 1.23x10^6, press 1 . 2 3 EE 6. For negative exponents, make sure to use the +- key to the right of the decimal point instead of the - key.

The calculator doesn't have any way to store equations, scientific or otherwise. If you mean scientific notation, use the EE key just above the 7 key to enter exponents. For example, to enter 1.23x10^6, press 1 . 2 3 EE 6. For negative exponents, make sure to use the +- key to the right of the decimal point instead of the - key.

Sep 22, 2010 | Texas Instruments TI-30XA Calculator

Use the toggle button above the enter key. It looks like 2 arrows

Feb 18, 2010 | Texas Instruments TI-30XA Calculator

190 people viewed this question

Usually answered in minutes!

×