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B
−3−√52
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C
1−√52
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D
1+√52
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Solution
The correct option is A−1±√52 y1=x2=m ⇒x=2m⇒y=m2 So equation of tangent is y−m2=m(x−2m) which passes through (-1, -1) ⇒−1−m2=m(−1−2m) ⇒m2+m−1=0⇒m=−1±√52