Question

Z=9x^2-y find the value of z when x=3 and y=9

Answer 1

it's 72

Explanation:

z = 9х^2 - у , when x = 3, y = 9, we'll get

z = 9* 3^2 - 9.

9 * 3^2 - 9 = 9*9-9 = 81 - 9 = 72

So, z = 72