Question

4) descompuneti in factori expresia E=(3x-5)^2 - (2x+1)^2

Answer 1

E = 9x^2 - 30x + 25 - ( 4x^2 + 4x + 1 )
E = 9x^2 - 30x + 25 - 4x^2 - 4x - 1
E = 5x^2 - 34x + 24

Formule de calcul prescurtat!!!!

Answer 2

Explicație pas cu pas:

Folosim formula a²-b²=(a+b)(a-b)

E(x)=(3x-5)²-(2x+1)² => E(x)=(3x-5-2x-1)(3x-5+2x+1)=>E(x)=(x-6)(5x-4)