Question about Texas Instruments TI-89 Calculator

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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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Posted on Jan 02, 2017

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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.

Dec 07, 2016 | Office Equipment & Supplies

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

Sorry, it does not display results as radicals, let alone simplify them.

Sep 18, 2014 | Casio FX-9750GII Graphing Calculator

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.

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

Recall (x+a)^2=x^2+2ax+a^2

Write x^2+2*(13/2)x+15, and compare the terms in x.

x^2+13x+15=x^2+2(13/2)x

The first three terms are the expansion of

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=

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.

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

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

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.

Feb 06, 2013 | Office Equipment & Supplies

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.

Jun 13, 2012 | Texas Instruments Ti-30Xs Multiview...

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.

Sep 16, 2011 | Casio FX9750GII Graphic Calculator

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.

toggle between exact and approximate (decimal).

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

Jul 08, 2011 | Texas Instruments TI-30X-IISTK Scientific...

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

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