Hi,

(8x-5) (x^2+6x) -(9x+2)(4x^2-3)= 

8x(x^2+6x)-5(x^2+6x)-9x(4x^2-3)-2(4x^2-3)] 

8x^3 + 48x^2 -5x^2 - 30x.....etc              ||finish Up, combine Like terms

 You can see the 8x^3 - 36x^3 = -28x^3 

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