Two sides of a triangle are 3x - 4 and 2x + 5. If the perimeter is 9x + 6, what is the length of the third side of the triangle?
Add the sides....subtract this sum from the perimeter
[3x - 4] + [2x + 5[ =
5x + 1
So
[9x + 6] - [ 5x + 1] =
4x + 5 = length of the remaining side
