Question

Find 3x2 - y3 - y3 - z if x = 3, y = -2, and z = -5.

Answer 1

first verify if you copied it correctly
it's odd to have "-y3-y3"

Answer 2

substitute the given values for the letters then do the calculation
example for 3x2 you would put 3*3^2 3*9 =27
instead of y3 it would be (-2)^3 = -8
simplify