Question

Descompuneti in factori :

Answer 1

Răspuns:

Explicație pas cu pas:

folosim formula a²-b²=(a+b)x(a-b)

${a)} \,\,4-(a-2b)^2=2^2-(a-2b)^2=(2-a+2b)(2+a-2b)$

folosim formula axb±axc=ax(b±c)

${b)} \,\,ax^3+bx^2-ax-b=x^2(ax+b)-1\cdot(ax+b)=(x^2-1)(ax+b)$