Solving Quadratics by the Square Root Property
The square root property says that if x 2 = c, then 
or 
. This can be written as “if x 2 = c, then 
.” If c is positive, then x has two real answers. If c is negative, then x has two imaginary answers.
Example 1
Solve each of the following equations.
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x 2 = 48
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x 2 = –16
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5 x 2 – 45 = 0
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( x – 7) 2 = 81
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( x + 3) 2 = 24
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