The equation of the common tangent to y2=4x and the curve x2+4y2=8 can be
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a
x-2 y+4=0
b
x+2 y+4=0
c
x-2 y=4
d
x+2 y=4
answer is A.
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Detailed Solution
The given curves are y2=4x and x28+y22=1Equation of tangents are y=mx+1 m and y=mx+8 m2+2comparing the above two line equations1m=8m2+2squaring on both sides and then cross multiplym=±12Equation of tangent is y=12x+2⇒2y=x+4⇒x−2y+4=0