# How do you solve 49x^3-81x=0?

$\implies x \left(7 x + 9\right) \left(7 x - 9\right)$
$x \left(49 {x}^{2} - 81\right)$
$\implies x \left({\left(7 x\right)}^{2} - {9}^{2}\right)$
$\implies x \left(7 x + 9\right) \left(7 x - 9\right)$