Answer
$(p^{3}+20q)^{2}$
Work Step by Step
$p^{6}+40p^{3}q+400q^{2}$
...write as the square of a binomial.
...($a=p^{3},\ b=20q,\ \quad $test the middle term:
$2ab=2(p^{3})(20q)=40p^{3}q$)
$=(p^{3}+20q)^{2}$
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