Answer
$25x^{8}-30x^{4}+9$
Work Step by Step
$(5x^{4}-3)^{2}$
Apply the formula for squaring a binomial, which is $(a-b)^{2}=a^{2}-2ab+b^{2}$
Here, $a=5x$ and $b=3$:
$(5x^{4}-3)^{2}=(5x^{4})^{2}-2(5x^{4})(3)+3^{2}=25x^{8}-30x^{4}+9$
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