Question

The perimeter of a triangle below is 6a + 2b -5 units. write expression to represent the length in units , of the missing side of the triangle

2a-3b
a-3

As are know sides.

Answer 1

P=s1+s2+s3 so...
6a+2b-5=(2a-3b)+(a-3)+s3
6a+2b-5=3a-3b-3+s3
3a+5b-2=s3

So the third side is 3a+5b-2