(2х-1)(1+2х)-(5-2х)^2

Question

(2х-1)(1+2х)-(5-2х)^2

Answer 1

" alt="(2x-1)(2x+1)-(5-2x)^2=4x^2-1-(2x-5)^2=4x^2-1-(4x^2-20x+25)=4x^2-1-4x^2+20x-25=20x-26=2(10x-13)

" align="absmiddle" class="latex-formula">