How to do this Areas between curves question?

**sobadin** · November 19th 2008, 04:45 PM

a) find the number (A) such that the line x= (A) bisects the area under the curve y= 1/x^2, 1 less than or equal to X which is less than or equal to 4

b)find the number (B) such that the line y=(B) bisects the area in part a)

**Pur** · November 19th 2008, 07:36 PM

Determine area:
a...
$\int_1^4 \frac{1}{x^2}dx=\frac{3}{4}$
We want the area that bisects ie. half of the area found above
$\int_1^t\frac{1}{x^2}dx=\frac{3}{8} \Rightarrow t=\frac{8}{5}$
So $x=\frac{8}{5}$

b...
again we want to bisect:
$\int_1^4\frac{1}{x^2}-b \quad dx=\frac{3}{8} \Rightarrow b=\frac{1}{8}$

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