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12-70.

Solve the equation below by completing the square. Give your answer(s) in exact (radical) form.

Use the Math Notes box.

Example 3: Solve by completing the square.

Solution: This method works most efficiently when the coefficient of is .
Rewrite the equation as . Rewrite the left side as an incomplete square:



Complete the square and rewrite as
or

Take the square root of both sides, . Solving for reveals that
or .