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Q.

If 13−4i is a root of ax2+bx+c=0,(a,bc∈R,a≠0), then

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a

b+6c=0

b

b=6c

c

a+25c=0

d

b2=6c

answer is A.

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Detailed Solution

TIP: As a,b,c∈R the other root must 13+4iThus, 13−4i+13+4i=−ba,and 13−4i⋅13+4i=ca⇒ 625=−ba and 125=caNow, 6ca=−ba⇒b+6c=0Also, a−25c=0.
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