1. 4.5 Solving Quadratic Equations by Finding Square Roots

2. 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.

3. Properties of Square Roots, (a > 0, b > 0)
Product Property:
Quotient Property;

4. Simplify: x

5. Simplify: x x x x x

6. In this example we will “rationalize the denominator”:

7. Solving a Quadratic Equation:
Solve:
Notice the graph of
Shown above, has x-intercepts a about 2.8 and –2.8