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20 January, 10:43

Find the derivative of f (x) = 7x + 9 at x = 6

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  1. 20 January, 10:57
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    F (x) = 7x+9

    f' (x) = 7

    f' (6) = 7

    answer: f' (6) = 7

    f' (x) = Lim x⇒0 (f (x+h) - f (x)) / h

    f' (6) = lim x⇒ 0 (7 (6+h) + 9 - (7*6+9)) / h

    =lim x⇒0 (42+7h+9-42-9) / h

    =lim x⇒0 (7h/h) = 7

    answer: f' (6) = 7
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