Example 9:  Solve x² + 3 = 4x

Solution:  First subtract 4x from both sides to get:

 x² – 4x + 3 = 0

Then factor the left side:

(x – 1)(x – 3) = 0

Now set each factor to 0 and solve:

x – 1 = 0   -->  x = 1

x – 3 = 0   -->  x = 3

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