Question

Разложите на множители:
1)(5a+6)²-81
2)25-(a+7)²
3)9m²-(1+2m)²

Answer 1

1)(5a+6)²-81=(5a+6-9)*(5a+6+9)=(5a-3)*5*(a+3)
2)25-(a+7)²=(5-a-7)*(5+a+7)=(-2-a)*(12+a)
3)9m²-(1+2m)²=(3m-1-2m)*(3m+1+2m)=(m-1)*(5m+1)