Answer:
x^2 + 10x +21
Step-by-step explanation:
Your multiplying the Squares together and then adding them
Blue Square : x*x= x^2
Pink Square : x*7= 7x
Green Square: x*3= 3x
Orange Square: 3*7= 21
Now we add all the squares together to get the total area.
x^2+7x+3x+21
x^2+ 10x +21
