# If the function f:R → R be given by f(x) = x2 + 2 and g :R → R be given by find fog and gof and hence find fog (2) and gof (– 3). [CBSE 2014]

f(x) = x2 + 2 and let us find fog

fog = f(g(x)) Replace x by in f(x) For fog(2) put x = 2 fog(2) = 6

Now let us find gof

gof = g(f(x))

gof = g(x2 + 2)

Replace x by x2 + 2 in g(x)  For gof(-3) put x = -3  Hence fog(2) = 6 and Rate this question :

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