7(а²-1)=7(a+1)(a-1)
3(b³-d⁹)
2x(x²-y²)=2x(x+y)(x-y)
2a(-4a⁴+4a²-1)
x(1+x)-4y(1+4y²)
b⁶(a-1)-b⁴(a-1)=(b⁶-b⁴)(a-1)
7(а²-1)=7(a+1)(a-1)
3(b³-d⁹)
2x(x²-y²)=2x(x+y)(x-y)
2a(-4a⁴+4a²-1)
x(1+x)-4y(1+4y²)
b⁶(a-1)-b⁴(a-1)=(b⁶-b⁴)(a-1)