product of algebraic expression :
(9x+4)(6x²-7x-4)
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(9x+4)(6x^2-7x-4)
9x (6x^2-7x-4) + 4 (6x^2-7x-4)
54x^3 - 63x^2 - 36x + 32x^2 - 28x - 16
54x^3 - 63x^2 + 32x^2 - 36x - 28x - 16
54x^3 - 31x^2 - 64x - 16
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