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If `A B`is a focal chord of `x^2-2x+y-2=0`whose focus is `S`and `A S=l_1,`then find `B Sdot`A. `(l_(1))/(2l_(1)-1)`B. `(l_(1))/(4l_(1)-1)`C. `(l_(1))/(2l_(1)+1)`D. None of these |
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Answer» Correct Answer - 2 `x^(2)-2x+y-2=0` `rArrx^(2)-2x+1=3-y` `rArr(x-1)^(2)=-(y-3).` Length of its latus rectum is 1 unit. Since AS, `(1)/(2)`, BS are in H.P., thus `(1)/(2)=(ASxxBS)/(AB+BS)rArrBS=(1)/(4I_(1)-I)` |
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