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18 March, 13:40

Find the following

f (x) = x^2 - 4x - 12

A) f (a+2)

B) f (a+h)

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Answers (1)
  1. 18 March, 14:54
    0
    (A) f (a + 2) = a² - 16

    substitute x = a + 2 into f (x)

    f (a + 2) = (a + 2) ² - 4 (a + 2) - 12

    = a² + 4a + 4 - 4a - 8 - 12

    = a² - 16

    (B) f (a + h) = a² + 2ah + h² - 4a - 4h - 12

    substitute x = a + h into f (x)

    f (a + h) = a² + 2ah + h² - 4a - 4h - 12
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