Question

Evaluate 4(a^2 + 2b) - 2b when a = 2 and b = –2.

Answer 1

4

Explanation:

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

2^2 = 4

4(4 + (2 * -2)) - (2 * -2)

2 * -2 = -4

4(4 + -4) - -4

- -4 = + 4

+-4 = -4

4(4 -4) + 4

4 - 4 = 0

4(0) + 4

4 * 0 = 0

0 + 4

0 + 4 = 4

4

Answer 2

4

Explanation:

4(4-4)+4=4

insert 2 in a and-2 in b