How do you multiply (4x-1)(4x+1)(4x1)(4x+1)?

1 Answer
Mar 3, 2018

16x^2-116x21

Explanation:

let 4x=a4x=a and 1=b1=b
(a+b)(a-b)=a^2-ab+ab-b^2(a+b)(ab)=a2ab+abb2
=a^2-b^2=a2b2
substitute back the values
(4x)^2-(1)^2(4x)2(1)2=16x^2-116x21