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Q.

If a,b,c∈R and a+b+c=0, the the quadratic equation 4ax2+3bx+2c=0 has

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a

one positive and one negative root

b

imaginary roots

c

real roots

d

none of these

answer is C.

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Detailed Solution

Let D be the discriminant of the given quadratic. Then      D=9b2−32ac⇒ D=9(−a−c)2−32ac              [∵a+b+c=0]⇒ D=9a2+9c2−14ac⇒ D=c29ac2−14ac+9=c23ac−732+329>0Hence, the roots are real.
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If a,b,c∈R and a+b+c=0, the the quadratic equation 4ax2+3bx+2c=0 has