Question

(x+5)(x+2)-3(4x-3)=(x-5)².

Answer 1

Răspuns:

Explicație pas cu pas:

(x+5)(x+2)-3(4x-3)=(x-5)²

(x+5)(x+2)-3(4x-3)=x²+5x+2x+10-12x+9=x²-5x+19

(x-5)²=x²-10x+25   ⇒(x+5)(x+2)-3(4x-3) ≠ (x-5)²

Answer 2

(x+5)(x+2)-3(4x-3)=(x-5)²

x²+7x+10-12x+9=x²-10x+25

x²-5x+19=x²-10x+25

-5x+19= -10x+25

5x=6

x=6/5