Răspuns:
Explicație pas cu pas:
8.
Folosim formula: (a²-b²)=(a+b)(a-b);
a) x²-25=(x+5)(x-5)
x²-100=(x+10)(x-10)
x²-1=(x+1)(x-1)
4x²-49=(2x+7)(2x-7)
9x²-1=(3x+1)(3x-1)
b) Folosim formula: a²+2ab+b²= (a+b)²;
x²+4x+4=(x+2)²
x²+6x+9=(x+3)²
x²+2x+1=(x+1)²
x²+10x+25=(x+5)²
4x²+4x+1=(2x+1)²
c) Folosim formula: a²-2ab+b²= (a-b)²
x²-6x+9=(x-3)²
x²-14x+49=(x-7)²
x²-2x+1=(x-1)²
4x²-20x+25=(2x-5)²
9x²-12x+4=(3x-2)²
16x²-56x+49=(4x-7)²
