Nullpo201

1)m³+27n³ = (m+3n)(m²-3mn+9n²)

2)x³-64xy² = x(x²-64y²) = x(x-8y)(x+8y)

3)-3a²+18a-27 = -3a²+9a+9a-27 = -3a(a-3)+9(a-3) = (a-3)(9-3a)