I need some help please : )

If you mean the fifth root, use the xth-root function (MATH 5). For example, to calculate the fifth root of 32, press 5 MATH 5 3 2 ENTER

You can't simply enter 7x+9=30 into the calculator, there is a way to calculate what the x is but its been a few years since I've done these..

Use the xth-root function in the MATH menu (it should be the fifth item). For example, to calculate the 15th root of 2, press 1 5 MATH 5 2 ENTER .

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.

Use the xth-root function accessible by pressing MATH 5. For example, to find the third root of 8, press 3 MATH 5 8 ENTER.

Use the xth-root function to compute any root. It's the fifth entry on the MATH menu, which you can get by pressing the MATH key. The fourth entry on the same menu gives you the third root without needing the 3 to be specified.

For example, to compute the 5th root of 32, press 5 MATH 5 3 2 ENTER.

4 MATH 5 5 7 ENTER

will calculate the fourth root of 57.

Press 2ND [square-root] 2ND [square-root] 8 3 ENTER on your TI-83Plus and see the result. Alternatively, you can press 4 MATH 5 8 3 ENTER and save a keystroke.

Press the MATH key to bring up the Math menu. Option 3 gives you cubed, option 4 gives you cube root, option 5 gives you nth root.

For example, 3rd root of 8: MATH 4 8 ENTER gives 2.

4th root of 16: 4 MATH 5 16 ENTER gives 2.

Press 4 then press math. Select #5. You'll be back at the home screen now type 90 and press enter. You can use this for any root.