Monday, March 24, 2014

2x+4x-6=?

Simplify
2x+4x-6


We can add like terms (i.e. those
terms with the same variables to the same powers) so we add 2x to 4x to get
6x.


Note that 6x and -6 are not
like terms since the term -6 doesnot have a variable, so we cannot add
them.


Thus the answer will be
6x-6.


** The question as originally written indicates an
equation. Equations can be solved,
while expressions can be simplified or
evaluated. If this had been an equation, then there would be no
unique answer, as the solution depends onthe value of x -- for each value of x the
expression takes on a new value. **

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