slope question - finding when a line is tangent to a curve

**Sneaky** · October 17th 2009, 05:43 PM

can anyone answer the question on the pic.....

**mr fantastic** · October 17th 2009, 05:57 PM

Originally Posted by Sneaky

can anyone answer the question on the pic.....

Solve the following two equations simultaneously for $c$ :

$\frac{c}{2 \sqrt{x}} = \frac{1}{2}$ .... (1)

$c \sqrt{x} = \frac{1}{2} x + \frac{9}{2}$ .... (2)

(Your other job, apart from solving these two equations, is to think about where they have come from).

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