Answers:
(-3x^2 y)^2 = (-3x^2 y)(-3x^2 y) = -3 * x^2 * y * -3 * x^2 * y...
= -3 * -3 * x^2 * x^2 * y^1 * y^1
= +9 * x^(2+2) * y^(1+1)
= +9 * x^4 * y^2
= 9 x^4 y^2
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