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Objectives The student will be able to: 1. simplify square roots, and 2. simplify radical expressions. SOL: A.3 Designed by Skip Tyler, Varina High School

If x2 = y then x is a square root of y. In the expression , is the radical sign and 64 is the radicand. 1. Find the square root: 8 2. Find the square root: -0.2

3. Find the square root: 11, -11 4. Find the square root: 21

6. Use a calculator to find each square root 6. Use a calculator to find each square root. Round the decimal answer to the nearest hundredth. 6.82, -6.82

What numbers are perfect squares? 1 • 1 = 1 2 • 2 = 4 3 • 3 = 9 4 • 4 = 16 5 • 5 = 25 6 • 6 = 36 49, 64, 81, 100, 121, 144, ...

Find a perfect square that goes into 147. 1. Simplify Find a perfect square that goes into 147.

Find a perfect square that goes into 605. 2. Simplify Find a perfect square that goes into 605.

Simplify .

How do you simplify variables in the radical? Look at these examples and try to find the pattern… What is the answer to ? As a general rule, divide the exponent by two. The remainder stays in the radical.

Find a perfect square that goes into 49. 4. Simplify Find a perfect square that goes into 49. 5. Simplify

Simplify 3x6 3x18 9x6 9x18

6. Simplify Multiply the radicals.

Multiply the coefficients and radicals. 7. Simplify Multiply the coefficients and radicals.

Simplify .

To simplify a radical, factor the expression under the radical sign to its prime factors. For every pair of like factors, bring out one of the factors. Multiply whatever is outside the sign, then multiply whatever is inside the sign. Remember that for each pair, you “bring out” only one of the numbers.