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Zero is an acceptable value for a variable.

As a general rule, if you solve an equation and get x equals zero, that's just what it is: zero. There is one solution.

Example: 10x +1 = 5x +1

5x = 1 - 1

5x = 0

x = 0

There is one solution, zero.

If you solve for x and get two solutions, such as 2 and 0, there are two answers.

Later on, if you've studied domain and range (the numbers you can use for x so that the equation is still defined, (i.e. not 1/0, or the square root of negative 1), you may find that x = 0 does not always work. You need to check first, to see if zero is in the domain, before you say it's an answer.

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13y ago

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