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22-06-2017
Mathematics

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if f(x)=x^2-81 and g(x)=(x-9)^-1 (x+9) find g(x) x f(x)

Respuesta :

23-06-2017

f(x)=x^2-81
g(x)=((x-9)^-1)(x+9)
f(x)*(g(x))
(x^2-81)((x+9)/(x-9))
((x+9)(x-9))((x+9)/(x-9))
(x+9)(x+9)
x^2+9x+9x+81
x^2+18x+81

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