Posted by Cassy on Tuesday, March 9, 2010 at 12:32am.
y = (x-2)^2
y = x^2-4x -4
dy = 2xdx - 4dx
so,
dy/dx = 2x-4
dx/dt = 2
so,
dy/dt = dy/dx dx/dt
= 2(2x-4)
= 4x-8
for x=1 then
dy/dt = 4(1)-8 = -4 units per second
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