Is my calculation correct in finding the expressions for the perimeters of the blue and red triangles, as well as their difference, and also the values of the perimeters when x=3?
To determine if your calculation is correct, I'll need to know the expressions you've obtained for the perimeters of the blue and red triangles, as well as their difference. Additionally, please provide the equations or expressions you used to find the perimeters.
Once I have this information, I can assess your calculations and help you determine if they are correct or guide you in finding the correct expressions.
As for finding the values of the perimeters when x=3, I will also need the expressions for the perimeters in order to substitute x=3 and calculate the corresponding values.