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A line from point P(2,-1) to the circle x^2+y^2+4x+4y+4=0 intersect it at A and B, then the value of PA.PB  is

Option: 1

12


Option: 2

13


Option: 3

16


Option: 4

None of these


Answers (1)

best_answer

\\\text{We know }\\ PA \cdot PB =S_1\\ S_1=(2)^2+(-1)^2+4 \times 2+4\times-1+4\\ PA \cdot PB =13

 

Posted by

Gautam harsolia

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