If f (x) = 2x + 3 , g(x) = 1−2x and h(x) = 3x, then find f o (g o h).
A
5 − 4x
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B
5 + 4x
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C
5 − 12x
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D
5 + 12x
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Solution
The correct option is C 5 − 12x Given: f(x) = 2x + 3, g(x) = 1−2x, h(x) = 3x Now, (f o g)(x) = f (g(x)) = f (1−2x) = 2(1−2x)+ 3 = 5−4x Then, (f o g) o h(x) = (f o g)(h(x)) = (f o g)(3x) = 5−4(3x) ⇒ (f o g) o h(x) = 5−12x Thus, (f o g) o h(x) = 5−12x