Math(Please check)

posted by Hannah

Find the slope of the graph at
y=sqrt 2x^2 +1 at the point (2,3).

First I plugged 2 into the equation and got 3. Then the derivative of the equation is 4x and then I multiplied that by 3 and got 12. Is this correct?

  1. helper

    y=sqrt 2x^2 +1 at the point (2,3).

    No, you are not correct.

    First, you need to find the derivative of,
    (sqrt(2x^2 + 1))
    dy/dx = 2x(2x^2 + 1)^(-1/2)

    This is the slope of the tangent line at P.

    Now plug in P(2,3)
    2x(2x^2 + 1)^(-1/2)
    2(2)(2(2^2) + 1)^(-1/2)
    4(8 + 1)^(-1/2)
    4 * (9)^(-1/2) = 4 * 1/(9^(1/2))= 4/3

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