Question

How do you FOIL `(x + 3)(5x - 7)`?

Answer 1

`5x^2+8x-21`

Explanation:

Multiply First `=> x xx 5x = 5x^2`
Multiply Outside `=> x xx -7 = -7x`
Multiply Inside `=> 3 xx 5x = 15x`
Multiply Last `=> 3 xx -7 = -21`

Now collect terms `5x^2-7x+15x-21=5x^2+8x-21`