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Questions  

 The equation of the common tangent to the circle (x-3)2+y2=9 and the parabola y2=4x, above the x-axis is

 

a
3 y=3x+1
b
3y=−x+3
c
3y=x+3
d
3 y=−3x+1

detailed solution

Correct option is C

Equation of the tangent to y2=4x is y=mx+1m→1(1) is a tangent to circle with center ( 3, 0) and r = 3r=d⇒3=3m+1m1+m2m=±13If   m=13⇒y=x3+3

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