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There is a formula for that equation to factor, and it is:
(a^3 - b^3) = (a - b)(a² + ab + b²)
It will only apply if b is a negative number.
We substitute a to st (cuberoot of s^3t^3), and b to -2u (cuberoot of 8u^3),
therefore the factored form is:
(st - 2u)(s²t² + 2stu + 4u²)
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