If the line y−3x+3=0 cuts the curvey2=x+2 at A and B and point on the line y−3x+3=0 is P (3, 0) then PA . PB =
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a
4(3+2)3
b
4(2−3)3
c
432
d
2(3+2)3
answer is A.
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Detailed Solution
The given line is y−3x+3=0 The slope of the above line is 3 Inclination is θ=600 andP(3,0)General point on the line y−3x+3=0 at a distance of r units from the point P is A3+r2,32r Since this point lies on the curve y2=x+2 (3r2)2=3+r2+2 3r2−2r−(8+43)=0product of roots=r1r2=PA·PB=ca PA.PB=|8+433| =4(2+3)3