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Q.

Suppose a,b,c,pRa0,c0 and b24ac>0

Statement-1: If the Roots of f(x)=ax2+bx+c=0 are
symmetrically placed on the real line about the point p
then p=-b2a and aap2+bp+c<0
Statement-2: If the roots of ax2+bx+c=0 are equal in magnitude but opposite in signs, then b = 0 and  ac < 0.

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a

STATEMENT-1 is True, STATEMENT-2 is True; STATEMENT-2 is a correct explanation for STATEMENT-1

b

STATEMENT-1 is True, STATEMENT-2 is True;  STATEMENT-2 is NOT a correct explanation for STATEMENT-1

c

STATEMENT-1 is True, STATEMENT-2 is False

d

STATEMENT-1 is False, STATEMENT-2 is True

answer is A.

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Detailed Solution

If α,α are roots of ax2+bx+c=0

then 0=α+(α)=b/ab=0

Also α(α)=c/a

As c0,α0 and therefore c/a=α2<0ac<0

Thus, Statement-2 is true.

If pα and p+α are roots of f(x)=ax2+bx+c=0, then α,α are roots of f(x+p)=a(x+p)2+b(x+p)+c=0,

that is, α,α are roots of ax2+(2ap+b)x+ap2+bp+c=0

By Statement-2:2ap+b=0p=b/2a and aap2+bp+c<0.

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