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- Apr 18th 2012, 12:11 AMrabert1simple derivative problem!
- Apr 18th 2012, 12:21 AMbiffboyRe: simple derivative problem!
Root(2x^2) =(root2)(rootx^2)=(root2)x So derivative is root2

- Apr 18th 2012, 12:22 AMearbothRe: simple derivative problem!
- Apr 18th 2012, 12:31 AMrabert1Re: simple derivative problem!
This is where I am stuck. I have to find the equation of a line tangent to the curve at the point (2,2)

but when I use the quotient rule to find the derivative I get stuck when differentiating

Why? Does the (from simplifying the root) get distributed to and ? If you know a simpler way of doing this please show me. - Apr 18th 2012, 12:54 AMearbothRe: simple derivative problem!
- Apr 18th 2012, 01:01 AMbiffboyRe: simple derivative problem!
Quotient rule not necessary here. f(x)=(root2)/2 times x^3/2

When differentiating (root2)/2 stays in front and x^3/2 becomes (3/2)x^1/2 You want this when x=2 ( I get 3/2 )