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Question

The equation(s) of tangents drawn from the point (1,4) to the parabola y2=12x is/are

A
xy+3=0
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B
xy+1=0
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C
x2y+4=0
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D
3xy+1=0
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Solution

The correct options are
A xy+3=0
D 3xy+1=0
Parabola equation : y2=12x
a=3
Equation of tangent in slope form is
y=mx+am
y=mx+3m
This equation passes through (1,4)
4=m+3m
4m=m2+3
m24m+3=0
m23mm+3=0
m(m3)1(m3)=0
(m1)(m3)=0
So, m=1,3
Equation of tangent :y=x+31
xy+3=0
For m=3, y=3x+33
3xy+1=0

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