Resposta :
P = 7x² + 9
explanations:
The perimeter of a triangle :
P = s + s + s
the letters are:
P = perimeter
s = side
then...
P = s + s + s
P = (2x²+ 7 ) + (x²- 2) + (4x²+ 4 )
P = 2x²+ 7 + x²- 2 + 4x²+ 4
P = 7x² + 9
so, the perimeter of this triangle is P = 7x² + 9
:) I hope I help you.