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Question

The number of real roots of the equation x23xx21+2+1x1=0 is

A
1
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B
0
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C
2
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D
infinitely many
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Solution

The correct option is A 1
x23xx21+2+1x1=0x(x3)(x+1)(x1)+2(x1)(x1)+1x1=01x21[x(x3)+2(x21)+(x+1)]=0here x210x±1x23x+2x22+x+1=03x22x1=03x23x+x1=0(x1)(3x+1)=0x=13

Hence, the number of real roots is 1.

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