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← JEE Main 2017 · 9 Apr · Shift 1
MathematicsSingle correct+4 / -1Question 79 of 90

JEE Main 2017 · 9 Apr · Shift 1, Mathematics question 79

A line drawn through the point P(4, 7) cuts the circle x2+y2=9x^2+y^2=9 at the points A and B. Then PA·PB is equal to :

Choose one option
Answer and worked solution

Official answer: B

PA·PB is the power of P: 42+72−9=564^2+7^2-9=56.

Topics:Tangents and normals
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