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17 March, 00:07

Given that f (x) = x^2 - 19 and g (x) = 17 - x, find (f- g) (5 ), if it exists.

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  1. 17 March, 00:58
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    x^2 - 19 - (17 - x).

    Distribute - 1 to each term of g (x).

    x^2 - 19 - 17 + x.

    Replace x with 5.

    5^2 - 18 - 17 + 5

    25 - 18 - 17 + 4

    Simplify.

    -6 is your answer.
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