If f(x)=12x^2-5 and g(x)=x+7 find (f•g)(x)

12x^3 + 84x^2 -5x -35

Step-by-step explanation:

multiply both of the polynomials together

12x^2 -5 * x + 7

First, multiply x with everything

12x^2 -5 * x = 12x^3 -5x

then, multiply 7 by everything

12x^2 -5 * 7 = 84 ^2 - 35

Last, add both of them together

12x^3 - 5x + 84x^2 - 35 = 12x^3 + 84x^2 -5x -35

12x^3 + 84x^2 -5x -35

3:5

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