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20 August, 20:19

For which value of c is the line y=3x+c a tangent to the parabola with equation y=x2-5x+7

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  1. 20 August, 20:23
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    Hello:

    the slope of tangent in A (x':y') is : f' (x') = 3

    f' (x) = 2x-5

    2x'-3 = 3

    2x' = 6

    x' = 3

    f (3) = 3²-5 (3) + 7=1

    1 = 3 (3) + c

    c = - 8
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