Answer:
4.41
Step-by-step explanation:
Use the definition of square:
[tex]a^2=a\times a[/tex]
Hence,
[tex]2.1^2=2.1\times 2.1[/tex]
Multiply 2.1 by 2.1 using column multiplication (or using calculator):
[tex]2.2\times 2.1=4.41[/tex]
so
[tex]2.1^2=4.41[/tex]
