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Composite Function

Writer's picture: Sean Melvein A. VecinaSean Melvein A. Vecina


Let f and g be a function. Composite function formula can be denoted by:

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


Example 1.

f(x) = x + 3

g(x) = x - 7


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

f(g(x)) = x + 3

f(g(x)) = g(x) + 3

f(g(x)) = x - 7 + 3

f(g(x)) = x - 4


Example 2.

f(x) = x + 7/x-3

g(x) = x - 2


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

f(g(x)) = x + 7/x - 3

f(g(x)) = g(x) + 7/ g(x) - 3

f(g(x)) = x - 2 + 7/x - 2 - 3

f(g(x)) = x + 5/ x - 5


Example 3.

f(x) = x^2 - 3x + 9

g(x) = x - 2


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

f(g(x)) = x^2 - 3x + 9

f(g(x)) = (x - 2)^2 - 3(x - 2) + 9

f(g(x)) = x^2 - 4x + 4 - 3x + 6 + 9

f(g(x)) = x^2 - 7x + 19



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