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College Algebra & Trigonometry, 2018a

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242 CHAPTER 4. FUNCTIONS<br />

8) A rectangle is inscribed in a semi-circle of radius 5 so that two corners are<br />

on the x axis and two corners are on the semi-circle.<br />

6 y =<br />

√<br />

25 − x<br />

2<br />

4<br />

2<br />

−5−4−3−2−1 1 2 3 4 5<br />

The formula for the graph of the semi-circle is y = √ 25 − x 2 .<br />

a) Express the area A of the rectangle as a function of x.<br />

b) For what value of x is the area largest?<br />

c) What is the maximum area?

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