Question

What is the value of the expression 2x^2 + 3xy -4y^2 when x = 2 and y = -4

Answer 1

all you are being asked to do is a simply substitution and then evaluate the answer


`2* 2^2 + 3*2*(-4) - 4* (-4)^2`

type it into your calculation the way I have written it, to get your answer.

Hope it helps