Question

Expand and simplify
(2x7 + 3)(4x + 5) - 8x(x° - 2)

Answer 1

the first step to solve this question is removing the (), it's way easier to solve a problem knowing what the question really says.

(2x²+3)(4x+5)-8x(x²-2)

= 2x²×4x + 2x²×5 + 3×4x + 3×5 -8x×x² -8x×-2

= 8x³+10x²+12x+15-8x³+16x

now, we add up the numbers with the same x's

8x³+10x²+12x+15-8x³+16x

= 0x³+10x²+28x+15

=10x²+28x+15