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Question

For what value of m does the equation, x2+2x+m=0 have two distinct real roots?

A
m = 1
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B
m < 1
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C
m > 1
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D
m = 2
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Solution

The correct option is B m < 1

Step 1 : For, x2+2x+m=0,
a=1, b=2, c=m

We know that

D=b24ac
D=(2)24m
=44m

Step 2 : The roots of a quadratic equation are real and distinct only when D>0

Step 3 : 44m>0

4>4m

m<1


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