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Q.

If the chord joining the points where x=p, x=q on the curve y=ax2+bx+c is parallel to the tangent drawn to the curve α,β then α=

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a

2 pq

b

pq

c

p+q2

d

p-q2

answer is C.

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Detailed Solution

Points                A p, ap2+bp+c

                           B q, aq2+bq+c

slope of AB=ap2-q2+b(p-q)p-q

                      =a(p+q)+b

dydx=2ax+bdydx α, β=2a α+β2α=p+q  α=p+q2

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