Answer:
16
Step-by-step explanation:
20^2 - 12^2 =
400-144 =
256 = 16^2
use formula a^{2}+b^{2}=c^{2}
x^2 + 6x + 8
area of blue = x^2
area of pink= 2x
area of green=4x
area of brown=8
Adding all the area.
we get : x^2 + 6x +8
2(+8x+17)
Factor out 2 of the equation.
14
2(9)-4=14
