Multiply (5x2 + x − 4)(x + 2).

5x3 + x2 − 4x − 8
5x3 + 11x2 − 2x − 8
5x3 + 10x2 − 4x − 8
5x3 + 20x2 + 2x − 8

(x + 2)(5x^2 + x - 4) =
x(5x^2 + x - 4) + 2(5x^2 + x - 4) =
5x^3 + x^2 - 4x + 10x^2 + 2x - 8 =
5x^3 + 11x^2 - 2x - 8 <===

The question is kind of confusing. if it's asking how many variations of answers can you give. then do 4^5 for your answer.this would be something like the first question could be a and the 2nd c or first b next c etc. if you can, ask the teacher for a better confirmation of what it's asking. if i'm assuming correctly what it's asking, it's 625 different variations.

Dcups i think