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JEE MATHEMATICS MCQ: PARABOLA

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Analyzing +4 | -1
Let focus of a parabola be α,β\alpha, \beta such that the lines x+y−3=0,x−y+3=0,x+2y−3=0x+y-3=0, x-y+3=0, x+2 y-3=0 and x−2y+3=0x-2 y+3=0 are tangents to the parabola, then the value of α−β\alpha-\beta is equal to
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Correct option: B
1
Option B (1) is correct because the focus of the parabola is found to be (0, -1) by solving the equations of the tangents, leading to α−β=0−(−1)=1\alpha - \beta = 0 - (-1) = 1.

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The equation of a common tangent to the parabolas y=x2y=x^2 and y=−(x−2)2y=-(x-2)^2 is A point PP moves such that slope of one tangent drawn from it to parabola y2=16xy^2=16 x is four times the slope of other tangent, then the length of latus rectum of the conic represented by locus of PP, is Let P,Q,RP,Q,R be three points on parabola y2=4x{y^2} = 4x and normal at PP and RR meet at QQ, then the locus of the mid-point of the chord PRPR is a parabola whose vertex is at The tangents at the end points of any chord through (1,0)(1,0) to the parabola y2+4x=8y^2+4 x=8 intersect The focus of the parabola x2=−16yx^2=-16 y is If II denotes the semi-latusrectum of the parabola y2=4ax{y^2} = 4ax and SPSP and SQSQ denote the segments of any focal chord PQ,SPQ,S being the focus, then SP,lSP,l and SQSQ are in the relation
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