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Show that if f(x): R exept 7by 5-R exep...

Show that if f(x): R exept 7by 5-R exept 3 by 5 is defined by 3x+ 4 by 5x-7 and g:R exept 3 by 5 -R exept 7 by 5 is defined by 7 x +4 by 5x- 3, then fog = IA and gof = IB , where, A = R exept 3 by 5, B = R exept 7by 5 ; IA (x) = x, ∀ x ∈ A, IB (x) = x, ∀ x ∈ B are called identity functions on sets A and B, respectively.

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