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Example 1: Find the roots of the equation

Solution. This equation is equivalent to

Since 1 has two square-roots  , the solutions for this equation are

Example 2: Find the roots of the equation

Solution. This example is somehow trickier than the previous one but we will see how to work it out in the general case. First note that we have

Therefore the equation is equivalent to

which is the same as

Since 3 has two square-roots  , we get

which give the solutions to the equation

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