calculus

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please help. Compute Δy and dy for x = 4 and dx = Δx = -0.2. (Round the answers to three decimal places.)
y = 4x - x2....im lost to were to start solving for delta y

  • calculus -

    To compute for dy, you use the equation dy=f'(a)*dx where f'(a) is the derivative of the function given.
    So dy=(4-2x)*dx Plug in the values
    dy=(4-2(4))*(-.2)=? SOLVE

    To find Δ y, you use the equation
    Δy=f(x-Δx)-f(x) Plug in the values
    Δy=(4(4.2)-(4.2)^2)-(4(4)-4^2)=? SOLVE

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