Question

SE CONSIDERA EXPRESIA E(x)=(2x-$3)^{2}$-(x+$1)^{2}$.
a) descompuneti expresia in produs de factori primi.
b)aratati ca E(x) este un patrat perfect
c)calculati E ($\frac{1}{2}$):E$(- \frac{1}{2} )$.

Answer 1

E(x)=[(2x - 3)+(x +1)][(2x-3) - (x+1)]=(3x-2)(x-4)
Am folosit relatia a^2-b^2=(a-b)(a+b)