Posted by **Annie** on Thursday, January 5, 2012 at 9:44pm.

find the area of the region enclosed by y=squareroot of x, the line tangent to y= squareroot of x at x=4 and the x-axis

- calculus -
**Steve**, Friday, January 6, 2012 at 11:02am
y = √x

y' = 1/2√x

So, at (4,2) the tangent line has slope 1/4.

So, the equation for the line is

(y-2)/(x-4) = 1/4

y = x/4 + 1

which insersects tha x-axis at x = -4.

Now, √x is not defined for x<0, so we need to break the region into two parts:

Int(x/4 + 1)dx [-4,0] + Int(x/4 + 1 - √x)dx [0,4]

= [x^2/8 + x)[-4,0] + (x^2/8 + x - 2/3x^3/2)[0,4]

8 - 16/3 = 8/3

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