26-01-2017
Mathematics

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Let f(x) = x2 + 6 and g(x)= x+8/x . Find ( g o f)( -7)

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26-01-2017

(g o f)(x)=g(f(x))
so

(g o f)(-7)=g(f(-7))=
g((-7)^2+6)=
g(49+6)=
g(55)=
55+8/55=
55 ad 8/55

(g o f)(-7)=55 and 8/55
(if you meant g(x)=(x+8)/x, then the result is 63/55 or 1 and 8/55)

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