1.

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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