Question about Texas Instruments TI-89 Calculator

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When i try to ask for the square root of 13 for example, it just outputs what i put in, rather then giving me a decimal.

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To convert a single result from symbolic to numeric form, press the diamond key and then the ENTER key. To have all results come out in numeric form, press MODE F2, press down-arrow to move down to the Exact/Approx line, press right-arrow, and select APPROXIMATE. Press ENTER twice to save the settings and exit the mode editor.

Posted on Nov 10, 2010

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1 Answer

The calculator does not show decimal when square rooting non-prime numbers. (fx-CG20)


You should feel happy that your calculator can perform some exact calculations. If you do not want the exact values you can press the SD key. You can also press SHIFT EXE rather than EXE alone.

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How do i find the square root of a number on the casio scientific calculator


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.

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

1 Answer

X^2+13x+22=7


x^2+13x+15=0
Recall (x+a)^2=x^2+2ax+a^2
Write x^2+2*(13/2)x+15, and compare the terms in x. a=13/2
x^2+13x+15=x^2+2(13/2)x+(13/2)^2-(13/2)^2+15
The first three terms are the expansion of (x+13/2)^2
You expression is equivalent to
(x+13/2)^2-[(13/2)^2-15]=(x+13/2)^2-[SQRT(109)/2]^2
Use the identity for the difference of two squares a^2-b^2=(a-b)(a+b)
This gives
x^2+13x+15=(x+13/2)^2-[SQRT(109)/2]^2=
[x+13/2 -SQRT(109)/2][x+13/2+SQRT(109)/2]
The polynomial can be written as (x-a)(x-b) (Note a has nothing to do with the one used above to complete the square. You can use any name for the roots, x_1, x_2, anything.
The two roots are on the screen captures below.

50683d1f-d4c4-43e6-8a47-b41eedc7a4cf.png985b04c7-b0cb-4d5a-9695-9d47c04c1a84.png

PS. I prefer to manipulate exact expressions with radicals. If you do not like it use the decimal approximations.

Jan 18, 2014 | Texas Instruments TI-84 Plus Calculator

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Fx-115es radical notation


This calculator can show the results in radical form if it involves square roots. The 4th root of 243 is 3 times the fourth root of 3, which unfortunately is beyond the calculator's capabilities to display in radical form. Try taking the fourth root of 3 (or equivalently, the square root of the square root of 3) and you'll see the calculator display the result in decimal.

Feb 06, 2013 | Casio Office Equipment & Supplies

1 Answer

Fx-115es radical notation


The calculator can show the results in radical form if it involves square roots. The 4th root of 243 is 3 times the fourth root of 3, which unfortunately is beyond the calculator's capabilities to display in radical form. Try taking the fourth root of 3 (or equivalently, the square root of the square root of 3) and you'll see the calculator display the result in decimal.

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1 Answer

Fraction to decimal function not working,only reducing decimals not converting them to fractions when using proper 2nd function option


To force the calculator to display a result as a decimal number, try putting a decimal mark at the end of a numerator or denominator. If you are using radicals, put a decimal point at the end. Example: enter square root of 2 as SQRT(2.). Notice the decimal mark at the end of 2.

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How do I get the answer into another square root. for example- Square root of 6 times square root of 15 is 3 times the square root of 10. But on the Casio FX9750GII it comes up as a decimal, how do i...


You cannot. The calculator does not have the Natural Display (math display) feature. I have heard that you can flash it with the OS of an FX-9860GII. At your own risk.

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1 Answer

I have a T1 30xs, and I am trying to figure square roots. It picks and chooses which square root it will give me. For example. it will give me the square for 729 and 64, but all it will do for, say, square...


The calculator is able to display fractions and certain irrational number as radicals. However there is the twosided arrow key to
toggle between exact and approximate (decimal).

Here is a screen capture from the manual to give you some more informations. k24674_127.jpg

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1 Answer

How do I find the square root of a number? and how do I enter scientific equations?


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.

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