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The distance of the point (3, p) from origin is 5 units then p is A) 7 B) 6 C) 5 D) 4 |
Answer» Correct option is (D) 4 Given that distance of point A(3, p) from origin O(0, 0) is 5 units. \(\therefore AO=5\) \(\Rightarrow AO^2=5^2=25\) \(\Rightarrow(0-3)^2+(0-p)^2=25\) \((\because AO=\sqrt{(0-3)^2+(0-p)^2})\) \(\Rightarrow9+p^2=25\) \(\Rightarrow p^2=25-9=16\) \(\Rightarrow p=\pm4\) \(\Rightarrow p=4\;or\;p=-4\) Correct option is D) 4 |
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