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Question

If x+x1=11, evaluate x2+x2.


A
119
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B
120
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C
121
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D
122
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Solution

The correct option is A 119

x+x1=11

(x+x1)2=112 [Squaring both the sides]

(x)2+(x1)2+2(x)(x1)=121

x2+x2+2=121 [(x)(x1)=x0=1]

x2+x2=1212=119


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