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11-05-2017
Mathematics

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what is (f*g)(x)? f(x)=x^4-9, g(x)=x^3+9

Respuesta :

16-05-2017

(x^4 - 9)(x^3 + 9)
This is a binomial * binomial. Use the FOIL method for multiplying.
First, outer, inner, last.
x^4 * x^3 = x^7
x°^4 * 9 = 9x^4
-9 * x^3 = -9 x^3
-9 * 9 = -81
Putting it back together.
x^7 +9x^4 -9x^3 - 81

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