1. Math 3-1: Warm-up

2. Objective: How to find the square roots of perfect squares.
Math 3-1: Square Roots
Objective: How to find the square roots of perfect squares.

3. Vocabulary
perfect square – a rational number whose square root is a whole number.
25 is a perfect square because its square root is 5.
square root – one of the two equal factors of a number.
square root of 144 = 12 since 122=144
radical sign – the symbol used to indicate a nonnegative square root ( ).
principal square root – a positive square root.

4. Find a Square Root

5. Use Square Roots to Solve an Equation
Take the square root of each side of the equation
Every positive number has both a positive and negative square root

6. Solve Equations

7. Math 3-2: Estimating Square Roots
Objective: How to estimate square roots.

8. ≈ about equal to (estimate)
Most numbers are not perfect squares. You can estimate square roots for these numbers.

9. Assignment
Pgs (14-36e; 38&40ec)