If you would like an in-depth review of fractions, click on Fractions.
Solve for x in the following equation.
Recall that you cannot divide by zero. Therefore, we must eliminate any
values of x that will cause the denominator to have a value of zero. We
determine these values by setting the denominators equal to zero and solving
The only way a product equals zero is if at least one of the factors equals
If any of the solutions turn out to be either 2, , we will discard them as extraneous solutions.
Simplify the equation by subtracting 3 from both sides of the original
Simplify the equation by getting rid of the denominators. You do this by multiplying both sides by the product of the denominators:
Rewrite the last equation in factored form.
The only way a product can equal zero is if at least one of the factors
Since is not a real number, the only real solutions is x=15.
Check the solution x=15 in the original equation for x. If the left side of the equation equals the right side of the equation after the substitution, you have found the correct answer.
Since the left side of the original equation is equal to the right side of the original equation after we substitute the value 15 for x, then x=15is a solution.
You can also check your answer by graphing
This means that there is one real solution and the solution is x=15.
If you would like to test yourself by working some problems similar to this example, click on Problem
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