What is the base area of the box.
length = 4 + x
width = x
height = x2 + 1
+

Dimension of the Box

Length = 4 + x

Width = x

Height = x²+ 1

Base area include ,Length and Width, which will be in the shape of Rectangle.

Area of Box= Length × Breadth

          =(4+x)× x

          Using Commutativity which states , ⇒ A × B=B × A

=x × (x+4)

Now, Using Distributivity with respect to Multiplication over Addition

=x²+4x

___=1 x²

___=4 x