Question

Se dă expresia E(x)=(2x+1)²-(2x-1)²+(x-2)(x+2)-7x+5
Arata ca A=(-7, 1)​

Answer 1

Răspuns:

Explicație pas cu pas:

E(x) = (2x+1)²-(2x-1)²+(x-2)(x+2)-7x+5

E(x) = (2x+1-2x+1)(2x+1+2x-1) + x²-4 -7x+5

E(x) = 2·4x + x²-7x+1

E(x) = x²+8x-7x+1

E(x) = x²+x+1 ; (∀) x ∈ R