Question

What is the product of (2x-1)(x+4)

Answer 1

`\large\boxed{(2x-1)(x+4)=2x^2+7x-4}`

Explanation:

`(2x-1)(x+4)\qquad\text{use FOIL:}\ (a+b)(c+d)=ac+ad+bc+bd\\\\=(2x)(x)+(2x)(4)+(-1)(x)+(-1)(4)\\\\=2x^2+8x-x-4\qquad\text{combine like terms}\\\\=2x^2+(8x-x)-4\\\\=2x^2+7x-4`