Question 2385
consider the line between the 2 points quoted to be the hypotenuse of a right-angled triangle. Use Pythagoras' theorem to find this distance.

The right angle of your triangle is at (3,5)...sketch it! YOU have to sketch things in maths!!!

horizontal line is length 3-(-2)=5
vertical line is length 17-5 = 12

so, x^2 = 5^2 + 12^2
--> x=13