Answer
$=9x^{4}y^{10}$
Work Step by Step
When a product is raised to a power, raise each factor to that power:
$$(-3x^{2}y^{5})^{2}$$
$$=(-3)^{2}x^{(2\times2)}y^{(5\times2)}$$
$$=9x^{4}y^{10}$$
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