Asked Feb 6, 2019
evolved and the avis

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2 evolved and the avis


Expert Answer

Step 1

If a function y = f(x) in the range for a ≤ x ≤ b, is rotated about x axis then the surface area, S of the solid so generated is given by the formula shown on the whiteboard.

Step 2

x = 9 - y2

when y = 1, x = 9 - 12 = 8

when y = 3, x = 9 - 32 = 0

Hence, a = 0 and b = 8 

y = f(x) and f'(x) will be as shown on the white board.

Step 3

Hence, the surface area, S will be evaluate...


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