a³-ab²
=a(a²-b²)
=a(a+b)(a-b)
8x³-72x
=8x(x²-9)
=8x²(x+3)(x-3)
m³n-9mn
=mn(m²-9)
=mn(m+3)(m-3)
x²(a-b)+(b-a)
=x²(a-b)-(a-b)
=(a-b)(x²-1)
=(a-b)(x+1)(x-1)
a³-ab²
=a(a²-b²)
=a(a+b)(a-b)
8x³-72x
=8x(x²-9)
=8x²(x+3)(x-3)
m³n-9mn
=mn(m²-9)
=mn(m+3)(m-3)
x²(a-b)+(b-a)
=x²(a-b)-(a-b)
=(a-b)(x²-1)
=(a-b)(x+1)(x-1)