Mathematics
JAMB 2005
Find the area of the figure bounded by the given pair of curves y = x
2 - x + 3 and y = 3
-
A.
17/6 units (sq)
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B.
7/6 units (sq)
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C.
5/6 units (sq)
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D.
1/6 units (sq)
Correct Answer: Option A
Explanation
Area bounded by
y = x2 - x + 3 and y = 3
x2 - x + 3 = 3
x2 - x = 0
x(x -1) = 0
x= 0 and x = 1
\(\int^{1}_{0}\)(x2 - x + 3)dx = [1/3x3 - 1/2x2 + 3x]\(^1 _0\)
(1/3(1)3 - 1/2(1)2 + 3(1) - (1/3(0)3 - 1/2(0)2 + 3(0))
= (1/3 - 1/2 + 3)- 0
= \(\frac{2-3+18}{6}\)
= 17/6
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