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Question

If f(x) = x2 – x + 1; g(x) = 7x – 3, be two real functions then (f + g)(3) is


  1. 18

  2. 3

  3. 25

  4. 7


Solution

The correct option is C

25


For functions f : X → R and g : X → R, we have

(f + g)(x) = f(x) + g(x), x Є X

Hence,

(f + g)(3) = f(3) + g(3) = 25

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