Question

How do you multiply `(4x-2)(4x+2)`?

Answer 1

Multiply each factor with each factor.

Explanation:

`(4x-2)(4x+2)=4x*4x+4x*2-2*4x-2*2=`
`=4^2x^2+(8-8)x-4=16x^2-4`

You can remember this formula:
`(a+b)(a-b)=a^2-b^2`

`(a-b)(a+b)=a*a+a*b-b*a-b*b=`
`=a^2+(ab-ba)-b^2=a^2-b^2`