Question

Разложите на множители:
1) 5x2y2 − 45y2c2; 2) 2x2 + 24xy + 72y2

Answer 1

1)=5(x²y²-9y²c²)=5y²(x²-9c²)=5y²(x-3c)(x+3c)
2)2(x²+12xy+36y²)=2(x+6y)²