Question

What is the value of the expression 2x2 + 3xy – 4y2 when x = 2 and y = –4?

Answer 1

Answer: The answer is -80

Step by Step Answer: Let: x = 2 and y = -4, Step 1: replace x with 2 and y with -4. use order of operations to simplify: 2%2A4+%2B+3%28-8%29+-+4%2816%29. 8+-+24+-+64

-16+-+64

-80

Answer 2

-80.

Explanation:

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

8+-24+-64

8+-88

-80