Question

Descompusa in factori expresia :E= (3x-5)² - (2x+1)² este ?

Answer 1

E= (3x-5)² - (2x+1)²=  [(3x-5) -(2x+1)][(3x-5)+(2x+1)]=

=(3x-5-2x-1)(3x-5+2x+1)=

=(x-6)(5x-4)

Answer 2

E= (3x-5)^2 - (2x+1)^2=  [(3x-5) -(2x+1)][(3x-5)+(2x+1)]=(3x-5-2x-1)(3x-5+2x+1)=(x-6)(5x-4)..... {DIFERENTA DE PATRATE: a^2-b^2=(a+b)(a-b)}