Answer
$100x^4+60x^2+9$
Work Step by Step
$(10x^2+3)^2$
$=(10x^2+3)(10x^2+3)$
$=10x^2(10x^2+3)+3(10x^2+3)$
$=100x^4+30x^2+30x^2+9$
$=100x^4+60x^2+9$
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