Let f (x) = 5x and g(x) = x2 + 1 , for x ∈ . (a) Find f-1(x) . (b) Find ( f ° g) (7) .
a,y=5xfinding the inverse: x=5y - dividing by 5 (1/5)x=y f-1(x)=(1/5)x
b,5x(72+1)=250
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