Answer:
The expression it is simplified as the sum of r and d squared:
(r+d)^2
Step-by-step explanation:
The equation describing the line can be stated as:
3(r+d)^2-2(r+d)^2
As both terms have a repeated factor, the expression can be simplifyed by factorizing with the repeated factor (r+d)^2:
(r+d)^2.(3-2) = (r+d)^2.(1) = (r+d)^2