Question

What is the value of the
expression below if a = -4, b = 5?

Answer 1

The answer should be 38
Sorry if it’s wrong

Answer 2

56

Explanation:

2a^2b+5ab-4

substitute a & b:

2(-4)^2(5)+5(-4)(5)-4

2(16)(5)+5(-4)(5)-4

160-100-4=56