Answer
$-8x^{12}y^{9}$
Work Step by Step
$(-2x^{4}y^{3})^3=(-2x^{4}y^{3})(-2x^{4}y^{3})(-2x^{4}y^{3})=(-2)(-2)(-2)(x^4)(x^4)(x^4)(y^{3})(y^{3})(y^{3})=-8x^{4+4+4}y^{3+3+3}=-8x^{12}y^{9}$
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