How to do this tricky maths question? - Printable Version
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How to do this tricky maths question? - [EDT]AmanSingh123 - 15.10.2011
The point C lies on line 1 and has x co ordinates equal to p
The lenght of AC is 5 units
Show that p satisfies p2 - 4p - 16 = 0
line 1 is y=-1/2x + 6
co ordinates of b is (-2, 7)
co ordinates of a is (2, 5)
Re: How to do this tricky maths question? - donB - 15.10.2011
Well, its really easy.
You got the slope of the line, which is -0.5.
Now, using the slope and the two equations obtained from the slopes of AC & CB, find y.
Substitute y in the distance ,(= 5), equation in terms of 'p'.
Solve the equation to obtain the relation.