Q.

Given ax2+bx+cAx2+Bx+C,xR,a,b,c,A,B,CR and d = b2–4ac>0 and D=B2–4AC > 0. Then which of the following statements are true

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a

|a||A|

b

|d||D|

c

|a||A|

d

if D, d are not necessarily positive then roots of ax2+bx+c = 0 and Ax2+Bx+C = 0 may not be equal

answer is A, B, D.

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Detailed Solution

Let α & β are the roots of Ax2 + Bx + c = 0
⇒∵ax2+bx+cAx2+Bx+cR
ax2 + bx + c = 0 also has α, β as roots
ax2+bx+c=|a||xα||xβ|=|A||xα||xβ| |a||A|&(αβ)2=(α+β)24αβb24aca2=B24ACA2|d||D|

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Given ax2+bx+c≤Ax2+Bx+C,∀x∈R,a,b,c,A,B,C∈R and d = b2–4ac>0 and D=B2–4AC > 0. Then which of the following statements are true