Mathematics
Grade10
Easy

Question

Let f(x) = 7x2 - 4x + 5 , g(x) = 9x - 10. Identify the rule for the function f - g.

  1. 7x2 + 5x - 5
  2. 7x2 + 13x + 15
  3. 7x2 - 13x + 15
  4. 7x2 + 5x - 15

hintHint:

(f - g) (x) = f(x) - g(x)

The correct answer is: 7x2 - 13x + 15


    Given f(x) = 7x2 - 4x + 5 , g(x) = 9x - 10
    (f - g) (x) = f(x) - g(x) = (7x2 - 4x + 5) - (9x - 10)
    = 7x2 - 4x + 5 - 9x + 10 = 7x2 - 13x + 15

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