Question

Multiply the polynomial expressions below.(7x+5)(2x^3-4x^2+9x-3)

Answer 1

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Answer 2

We have that:

`(7x+5)(2x^3-4x^2+9x-3)=`

`7x(2x^3-4x^2+9x-3)+5(2x^3-4x^2+9x-3)`

`=(14x^4-28x^3+63x^2-21x)+(10x^3-20x^2+45x-15)`
Now we add monomials of the same grade and we get:

`14x^4-18x^3+43x^2+24x-15`