18 - Co ordinate Geometry Questions Answers

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Sir, point O (triangle MOS) denotes the origin (0,0)....
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Joshi sir comment

Let the lines in the pair are m1x-y=0 and m2x-y=0 Find perpendiculars from (x,,y,) on lines and calculate their sum Use formulae m1+m2 = -2hb and m1m2= ab Inform for any issue

Tangents are drawn to the circle x^2 + y^2=12 at the points where it is met by the circle x^2 +y^2 - 5x + 3y - 2=0.Find the point of intersection of these tangents.

Asked By: SUSHOVAN HALDAR
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Joshi sir comment

sovle the two eqs for x and y,

method : 

x^2 + y^2=12 

on putting this in 2nd eq. we get -5x+3y = -10 so x = (3y+10)/5

so [(3y+10)/5]+ y2= 12

now get y then x, then get the tangents in the first circle and then intersection point of the tangents.

ƒ(x)=|x-2| and g=ƒoƒ so g'(x)=.......? ; 2<x<4

Asked By: BONEY HAVELIWALA
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Joshi sir comment

for 2<x<4,   f(x) = x-2

so g(x) = f(x-2) = x-2-2 = x-4

so g'(x) = 1 

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