The area (in sq. units) of the largest rectangle ABCD whose vertices A and B lie on the x-axis and vertices C and D lie on the parabola, y=x2−1below the x-axis, is:
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a
43
b
133
c
433
d
233
answer is C.
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Detailed Solution
Area =2aa2-1A=2a1-a2 for maxdAda=2-6a2=0a=±13d2 Ada2=-12a <0 For max, a=13 So area= 231-13433