Answer
$s^{2}+12st^{2}+36t^{4}$
Work Step by Step
$(s+6t^{2})^{2}=$
...square the binomial.
$=(s)^{2}+2(s)(6t^{2})+(6t^{2})^{2}$
...simplify.
$=s^{2}+12st^{2}+36t^{4}$
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