Question

8xy-7y^2
if x = -2 and y = -4

Answer 1

8xy - 7y^2

x = -2 and y = -4

This means that you replace every x in the equation with -2 and every y with -4.

8(-2)(-4) - 7(-4)^2

8*-2= -16*-4 = 64

7*-4 = -28^2 = -784

64 - (-784)

-*- = +

64 + 784 = 848