If f(x)=3x+10,g(x)=x^2-1, then 〖(fog)〗^(-1) is equal to

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If f(x)=3x+10,g(x)=x^2-1, then 〖(fog)〗^(-1) is equal to
(a) ((x-7)/3)^(1/2) (b) ((x+7)/3)^(1/2)
(c) ((x-3)/7)^(1/2) (d) ((x+3)/7)^(1/2)

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