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Solve and check:
Subtract 4 from both sides.
Now square both sides.(Caution! Squaring may introduce an extraneous root)
Solve by factoring.
Apply the zero products principle.
The roots are(?):
y = 9
y = 1
The last solution is an extraneous solution introduced by squaring. Remember that
The first solution doesn't check. Extraneous solution was introduced when squaring during the solving process.