Enter topic text here.
You can use variables in your expressions.
Here is how to define a variable:
You use := to assign a variable, and you end the assignment with a ;
Then you just type your expression as you like, and a will be calculated throughout the expression.
Now, anywhere you use a in the expression, it will be interpreted as it's value.
You can even assign multiple variables.
then use them like this:
a:=5; 2+a = 7
a:=2; 2*a-40+a = -34
a:=3;b:=2; 2*b+(a*a) = 13
a:=5; 2*a*(2*2)2 = 80
You cannot write 2a to multiply; you have to write 2*a. If you write 2a, Calculor will think you are writing 22. Or it will just get confused (sorry for that).
Also, you can't use the letter e for a variable because it is already taken for the Euler's Constant.