Substitute Command

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Substitute[ <expression>, <from>, <to> ]
Substitutes from in expression with to.
Example:
Substitute[(3 m - 3)^2 - (m + 3)^2, m, a] yields 8 a2 - 24 a.


Substitute[ <Expression>, <Substitution List> ]
Substitutes in expression every variable of the list with the variable or number you choose for it.
Example:
Substitute[2x + 3y - z, {x=a, y=2, z=b}] yields 2a - b + 6.
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