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Joint Entrance Examination
Mathematics
Area Under Curves
Question 124
Question 124 of 230
Medium
MCQ
The area (in sq. units) of the region bounded by the curve
x
2
=
4
y
x^2=4y
x
2
=
4
y
and the straight line
x
=
4
y
−
2
x=4y-2
x
=
4
y
−
2
is:
A
5
4
\dfrac54
4
5
B
9
8
\dfrac98
8
9
C
7
8
\dfrac78
8
7
D
3
4
\dfrac34
4
3
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Official solution
x = 4y - 2 \& x2 = 4y \[ \Rightarrow \] x2 = x + 2 \[ \Rightarrow \] x2 - x - 2 = 0 x = 2, - 1 So, \[\int\limits_{ - 1}^2 {\left( {{{x + 2} \over 4} - {{{x^2}} \over 4}} \right)\,dx = {9 \over 8}} \]
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