Equation or formula:
 Choose Insert > Equation and choose the equation you
want from the gallery.  After you insert the equation Tools The Design tab opens with symbols and structures that can be added to your equation.
Simple Equation:
 A mathematical equation that represents the
relationship of two expressions on either side of the sign. It mostly has one
variable and equal to a symbol. Example: 2x – 4 = 2. In the given example, x is a
variable.
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Insert Mathematical Symbols
Word for Microsoft 365 Word
2019 Word 2016 Word 2013 Word 2010 Word 2007
In
Word, you can insert mathematical symbols into equations or text by using the
equation tools.
1.
On the Insert tab,
in the Symbols group, click the arrow under Equation, and then
click Insert New Equation.
2.
Under Equation
Tools, on the Design tab, in the Symbols group, click
the More arrow.
3.
Click the arrow next
to the name of the symbol set, and then select the symbol set that you want to
display.
4.
Click the symbol that
you want to insert.
Available
symbol sets
The
following mathematical symbol sets are available in the Symbols group
in Word. After clicking the More arrow, click the menu at
the top of the symbols list to see each grouping of symbols.
Symbol 
Subset 
Definition 
Basic 
None 
Commonly 
Greek 
Lowercase 
Lowercase 
Uppercase 
Uppercase 

LetterLike 
None 
Symbols 
Operators 
Common 
Symbols 
Common 
Symbols 

Basic 
Operators 

Advanced 
Additional 

Advanced 
Additional 

Arrows 
None 
Symbols 
Negated 
None 
Symbols 
Scripts 
Scripts 
The 
Frakturs 
The 

DoubleStruck 
The 

Geometry 
None 
Commonly 