# GMAT Math : Solving equations

## Example Questions

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### Example Question #71 : Solving Equations

Express  in terms of .

Explanation:

By two substitutions:

### Example Question #71 : Equations

Which of the following is the solution set of the equation:

Explanation:

Square both sides of the equation, then solve the resulting quadratic equation by factoring:

Either

or

Checking both solutions, however:

This eliminates 0 as a solution.

8 turns out to be the only solution.

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