Hi, In 3 steps...

(x^2+7) (x^3-5x-4) = x^2(x^3-5x-4) + 7(x^3-5x-4)

                              = x^5-5x^3-4x^2 + 7x^3-35x-28

                              = x^5+2x^3-4x^2 -35x-28

  

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