Posted by nic on .
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 
Spider Man,
To compute for dy, you use the equation dy=f'(a)*dx where f'(a) is the derivative of the function given.
So dy=(42x)*dx Plug in the values
dy=(42(4))*(.2)=? SOLVE
To find Δ y, you use the equation
Δy=f(xΔx)f(x) Plug in the values
Δy=(4(4.2)(4.2)^2)(4(4)4^2)=? SOLVE