Answer:29m²
Step-by-step explanation:
area of each wall face = x²+3x+ 2
d/dx = x = 3/2 or 1.5
subs : (1.5)²+3(1.5)+2 = 8.75 m² per wall area
1 door = x²+x = 1.5²+1.5 = 3.75m²
1 window = x² = 1.5² =2.25m²
4x8.75 = 35m² total 4 face area wall
now the total area andrew will paint is = Total.wall - door - window =29sqm
paint area = 35-3.75-2.25 = 29m²