math

Find the slope m of the tangent to the curve
y = 5/ sqrt (x) at the point where
x = a > 0.
what is the slope?

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  1. y = 5x^(-1/2)
    dy/dx = (-5/2)x^(-3/2)

    so when x=a

    slope = (-5/2)x^(-3/2)

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  2. the answer is -5/a^2

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  3. -5/(a)(2 sqrt a)

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  4. -5/2a^3/2

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  5. WRONG

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