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Question

Slope of tangent to x2=4y from (-1, -1) can be

A
1±52
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B
352
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C
152
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D
1+52
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Solution

The correct option is A 1±52
y1=x2=m
x=2my=m2
So equation of tangent is ym2=m(x2m) which passes through (-1, -1)
1m2=m(12m)
m2+m1=0m=1±52

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