Posted by asaereay on Friday, November 2, 2012 at 8:15am.
find the equation of the tangent line to f(x)=square root x passing through (4,0)

AP Calc.  Reiny, Friday, November 2, 2012 at 8:26am
y = √x = x^(1/2)
dy/dx = (1/2)x^(1/2) = 1/(2√x)
so at (4,0), dy/dx = 1/2√4 > undefined in the real numbers
uh uh!!
look at y = √x, the point (4,0) does not lie on your curve, so ...... bogus question
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