# How do you multiply (-bc+a^2)(bc+a^2)?

${a}^{4} - {b}^{2} {c}^{2}$
$\left({a}^{2} + b c\right) \left({a}^{2} - b c\right)$
$\left({x}^{2} - {y}^{2}\right) = \left(x + y\right) \left(x - y\right)$
If we let $x = {a}^{2}$ and $y = b c$
$\left({\left({a}^{2}\right)}^{2} - {\left(b c\right)}^{2}\right) = \left({a}^{2} + b c\right) \left({a}^{2} - b c\right)$