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Published byCordelia Jody Owen Modified over 6 years ago
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4.5 Solving Quadratic Equations by Finding Square Roots
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A positive number s has two square roots
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 > 0, b > 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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