Question

(2x - 1)(x + 4)
using foil to multiply binomials

Answer 1

2x^2 + 7x -4

Explanation:

First: 2x*x = 2x^2

Outside: 2x*4 = 8x

Inside: -1*x = -x

Last: -1*4 = -4

Add all products into one line

2x^2 + 8x -x -4

Simplify/Combine like terms

2x^2 + 7x -4

Answer 2

2x^2+7x-4

Explanation:

Use FOIL: multiply the first terms, inside terms, outside terms and last terms.

(2x-1)(x+4)

F: first terms: 2x*x=2x^2

O: outside terms: 2x*4=8x

I: inside terms: -1*x=-x

L: last terms: -1*4=-4

Add everything together

2x^2+8x-x-4

Combine like terms

2x^2+7x-4