Answer:
5x(x+4)
Explanation:
break the figure into 2 parts the rectangle and the triangle
rectangle: 2x* (2x+6)
4x^2 + 12x
triangle = 1/2 b*h
= 1/2(2x) * (x+8)
= x* (x+8)
x^2 + 8x
add the two parts together
4x^2 + 12x+ x^2 + 8x
4x^2 + x^2 + 12x+8x
5x^2 + 20x
factor out a 5x
5x(x+4)