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The TI-89 does not have a cube root function. However, you can calculate any root simply by raising to the reciprocal of the power. For example, to calculate the cube (third) root of 125, press 5 ^ ( 1 / 3 ) ENTER
Square root of 39: Press 3 9 [square-root] =
[square-root] is the key just to the left of the divide key.
Cube root of 9482: Press 9 4 8 2 2nd [cube-root] = [cube-root] is the shifted function of the 0 key.
For other roots, you can use the [nth-root] function, the shifted function of the key above the divide key. For example, to calculate the fourth root of 16, press 1 6 2nd [nth-root] 4 =
Use the cube-root function, which is the shifted function of the square-root key (third row, second column). For example, to find the cube root of 8, press
SHIFT [cube-root] 8 =
For cube roots, use the cube-root function in the MATH menu. For example, to calculate the cube root of 8, press MATH 4 8 =
For other roots (including cube root), use the xth-root function in the MATH menu. For example, to calculate the fifth root of 32, press 5 MATH 4 3 2 =
You can calculate cube roots by using the cube root function (the 2nd-shift of the 0 key). You can calculate arbitrary roots by using the x-root function (the 2nd-shift of the y^x key, just above the divide key).
Welp on a Ti-93 using the 2nd function click on the function look for the cube root function barring that look for the x root function you can make the x any number root
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