Question 82708
A) This problem can be solved by adding together the sides of the triangle and collecting the coefficients of x.

The perimeter (P) of a triangle is equal to the sum of its three sides, in this case:

P = (3x+7) + (4x-9) + (5x-6)

If we group together the coefficients (numbers multiplied by x) and constants, we can condense the expression into a single polynomial:

P = (3+4+5)x+(7-9-6)

  = 12x-8