Posted by Veronica on Wednesday, July 23, 2008 at 8:10pm.
h(x) = 7x *(5-2x)^-1/2
dh/dx = 7 (5-2x)^-1/2
+ (7x)d/dx(5-2x)^-1/2
Use the chain rule on the second term
d/dx(5-2x)^-1/2 = (-1/2)(-2)(5-2x)^-3/2
= (5-2x)^-3/2
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