Answer:
Perimeter =
feet
Explanation:
The perimeter of a triangle is sum of all the three sides. To get the perimeter (the expression) we add the expressions of all the three sides and do algebra:
12x + 15x + 4 + 10x + 3x^2 - 8
3x^2 + 12x + 15x + 10 x + 4 - 8 [rearranged]
3x^2 + 37x - 4
Hence, the perimeter is
feet