# Solve for y y = square root of 81- cube root of -64

y=81–643
Simplify each term.
Rewrite 81 as 92.
y=92–643
Pull terms out from under the radical, assuming positive real numbers.
y=9–643
Rewrite -64 as (-4)3.
y=9-(-4)33
Pull terms out from under the radical, assuming real numbers.
y=9–4
Multiply -1 by -4.
y=9+4
y=9+4
y=13
Solve for y y = square root of 81- cube root of -64

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