NCERT Class XI Mathematics - Complex Numbers and Quadratic Equations - Solutions

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Question : 31
Total: 52
x2+x+
1
2
= 0
Solution:  
We have , x2+x+
1
2
= 0
Comparing the given equation with the general form ax2 + bx + c = 0,
we get a = 1 , b = 1 , c =
1
2

∴ x =
b±b24ac
2a
=
1±(1)24×1×
1
2
2.1
=
1±122
2

=
1±(22)1)
2
=
1±i(221)
2

∴ The roots of the given equation are
1+i(221)
2
and
1i(221)
2
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