4.5 Solving Quadratic Equations by Finding Square Roots

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4.5 Solving Quadratic Equations by Finding Square
Roots
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A number r is a square root of a number s if
A positive number s has two square roots
The symbol
is a radical sign.
The number s beneath the radical sign is called
the radicand.
The expression
is a radical.
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Properties of Square Roots, (a gt 0, b gt 0)
Product Property
Quotient Property
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Simplify
x
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Simplify
x
x
x
x
x
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In this example we will rationalize the
denominator
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Solving a Quadratic Equation
Solve
Notice the graph of
Shown above, has x-intercepts a about 2.8 and
2.8
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