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MathematicsParabolaGeneralHard2 minPYQ_2020
MathematicsHardsingle choice

Fora>0,let the curvesC1:y2=axandC2:x2=ayintersect at originOand a pointP.Let the linex=b0<b<aintersect the chordOPand thex-axis at pointsQandR,respectively. If the linex=bbisects the area bounded by the curves,C1andC2,and the area ofOQR=12,then ‘a’ satisfies the equation:

Options:

Answer:
B
Solution:

0bax-x2adx=a26

23ab32-b33a=a26           ...1

Also area of ΔOQR=12 

12b2=12b=1

Put in 1

4aa-2=a3

a6+4a3+4=16a3

a6-12a3+4=0

Stream:JEESubject:MathematicsTopic:ParabolaSubtopic:General
2mℹ️ Source: PYQ_2020

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