expansion
noun
- 1
the act of increasing (something) in size or volume or quantity or scope
- 2
adding information or detail
- 3
a discussion that provides additional information
- 4
a function expressed as a sum or product of terms
the expansion of (a+b)^2 is a^2 + 2ab + b^2
Also useful for “expansion”:Scrabble— High-value letters — see what it scores