...=-8x^-2y^-3
...= 20xy^-3
2 x^3 y^-7 *(-4 x^-5 y^4)= 2 * (-4) * x^(3 + (-5)) y^(-7 + 4) = - 8 x^(-2) y^(-3)
4x^3 y^2 * 5 x^-2 y^-5= 4 * 5 * x^(3 + (-2)) y^(2 + (-5)) = 20 x^1 y^(-3) = 20xy^(-3)
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...=-8x^-2y^-3
...= 20xy^-3
2 x^3 y^-7 *(-4 x^-5 y^4)= 2 * (-4) * x^(3 + (-5)) y^(-7 + 4) = - 8 x^(-2) y^(-3)
4x^3 y^2 * 5 x^-2 y^-5= 4 * 5 * x^(3 + (-2)) y^(2 + (-5)) = 20 x^1 y^(-3) = 20xy^(-3)