# Math Help - Easy algebra

1. ## Easy algebra

In a right angle triangle the hypotenuse is 15cm. If the second side is twice the length of the third side, calculate the exact length of the shortest side

2. Originally Posted by nerdzor
In a right angle triangle the hypotenuse is 15cm. If the second side is twice the length of the third side, calculate the exact length of the shortest side
Let the shortest side have length x.

Then $x^2 + (2x)^2 = 15^2 \Rightarrow x^2 + 4x^2 = 225$.

I hope you can solve for x from here ......