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If f ∶ R → R and g ∶ R → R are two mappings defined as f(x) = 3x and g(x) = 3x2 + 9, then the value of (f + g) (2) is:

  1. 21
  2. 23
  3. 27
  4. 20

Answer (Detailed Solution Below)

Option 3 : 27
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Detailed Solution

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Calculation:

Given, f(x) = 3x, g(x) = 3x2 + 9

then, (f + g)(2) = f(2) + g(2)

= (3 × 2) + (3 × 22 + 9)

= 6 + 21

= 27

 ∴ The value of (f + g) (2) is 27

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