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Find (f ◦ g)(x), (g ◦ f )(x), domain and range of (f ◦ g)(x).(a) f (x) = 2x + 4, g(x) = 3x − 5(b) f (x) = √x + 2, g(x) = 2x − 4(c) f (x) = 1x , g(x) = 1x(d) f (x) = x2, g(x) = x − 3(e) f (x) = x2 + 2, g(x) = √x − 4

Question

Find (f ◦ g)(x), (g ◦ f )(x), domain and range of (f ◦ g)(x).(a) f (x) = 2x + 4, g(x) = 3x − 5(b) f (x) = √x + 2, g(x) = 2x − 4(c) f (x) = 1x , g(x) = 1x(d) f (x) = x2, g(x) = x − 3(e) f (x) = x2 + 2, g(x) = √x − 4

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Solution

(a) f(g(x)) = f(3x - 5) = 2(3x - 5) + 4 = 6x - 10 + 4 = 6x - 6 g(f(x)) = g(2x + 4) = 3(2x + 4) - 5 = 6x + 12 - 5 = 6x + 7 Domain of f(g(x)) is all real numbers. Range of f(g(x)) is all real numbers.

(b) f(g(x)) = f(2x - 4) = √(2x - 4 + 2) = √(2x - 2) g(f(x)) = g(√x + 2) = 2(√x + 2) - 4 = 2√x + 4 - 4 = 2√x Domain of f(g(x)) is x ≥ 1. Range of f(g(x)) is y ≥ 0.

(c) f(g(x)) = f(1/x) = 1/(1/x) = x g(f(x)) = g(1/x) = 1/(1/x) = x Domain of f(g(x)) is all real numbers except 0. Range of f(g(x)) is all real numbers except 0.

(d) f(g(x)) = f(x - 3) = (x - 3)^2 g(f(x)) = g(x^2) = x^2 - 3 Domain of f(g(x)) is all real numbers. Range of f(g(x)) is y ≥ 0.

(e) f(g(x)) = f(√x - 4) = (√x - 4)^2 + 2 = x - 8√x + 16 + 2 = x - 8√x + 18 g(f(x)) = g(x^2 + 2) = √(x^2 + 2) - 4 Domain of f(g(x)) is x ≥ 16. Range of f(g(x)) is y ≥ 0.

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