algebra
posted by Precious .
The perimeter of triangle ABC is 4x+1,if 2 sides are x+2 and x1,find the 3rd side

what's the problem?
perimeter is the sum of the sides.
Let z be the third side.
x+2 + x1 + z = 4x+1
z = 4x+1  (x+2)  (x1)
z = 4x+1x2x+1
z = 2x