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Question

Discuss the nature of roots of the given equation, x22x+3=0

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Solution

We know that while finding the root of a quadratic equation ax2+bx+c=0 by quadratic formula x=b±b24ac2a,
if b24ac>0, then the roots are real and distinct
if b24ac=0, then the roots are real and equal and
if b24ac<0, then the roots are imaginary.

Here, the given quadratic equation x22x+3=0 is in the form ax2+bx+c=0 where a=1,b=2 and c=3, therefore,
b24ac=(2)2(4×1×3)=412=8<0

Since b24ac<0

Hence the roots are imaginary or no real roots.

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