$$-48x^3-30x^2+54x . $$
Work Step by Step
By multiplying each term of the polynomial by the monomial, and then adding the products, we have $$-6x(8x^2+ 5x - 9)=-6x(8x^2)-6x( 5x)-6x( - 9)\\ =-48x^3-30x^2+54x . $$
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