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23 October, 05:45

If f (x) = 3x+1 then f (a+h) - f (a)

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  1. 23 October, 05:57
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    F (x) = 3x+1

    put x = a+h

    f (a+h) = 3 (a+h) + 1

    f (a+h) = 3a + 3h + 1

    put x = a

    f (a) = 3a + 1

    f (a+h) - f (a) = 3a + 3h + 1 - (3a+1)

    f (a+h) - f (a) = 3a + 3h + 1 - 3a - 1

    f (a+h) - f (a) = 3h
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