The base area of box 3, whose length is x²+x is x⁴+x²+2x³
Cube is a 3d figure whose all sides are equal and has 8 vertices , 6faces .
Volume=a³
Surface area=6a²
Base area=a²
a=x²+x
base area of a square =a²
=(x²+x)²
=x⁴+x²+2x³
Therefore, the base area of box 3, whose length is x²+x is x⁴+x²+2x³
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