38 Squares and Square Roots 25 64 144 225 400 1 5 2 2 8 2 3 12 2 4 15 2 5 20 2 Learn to find square roots amp cube roots Squares and Square Roots ID: 750699
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Slide1
Warm UpSimplify.
Pre-Algebra
3-8
Squares and Square Roots
25
64
144
225
400
1.
5
2
2. 82
3. 122 4. 152
5.
20
2Slide2
Learn to find square roots & cube roots.Squares and Square RootsSlide3
Square rootsEvery number has 2 square roots:positive square rootNegative square rootsPrincipal square root is the positive square roots.perfect square: a number that has integers as its square roots.
Examples are 1,4,9,16, etcSlide4
Find the two square roots of each number.49 = –7
–
49
= 7
100
= 10
100
= –10
–
A. 49
B. 100
C. 225
225
= 15
225
= –15
–Slide5
A. 2525 = –5–
25
= 5
144
= 12
144
= –12
–
Find the two square roots of each number.
B. 144
C. 289
289
= 17
289
= –17
–Slide6
Watch brainpopSlide7
Joke of the dayTEACHER: Donald, what is the chemical formula for water?DONALD: H I J K L M N O.TEACHER: What are you talking about?DONALD: Yesterday you said it's H to O.Slide8
132 = 169The window is 13 inches wide.Find the square root of 169 to find the width of the window. Use the positive square root; a negative length has no meaning.
A square window has an area of 169 square inches. How wide is the window?
So 169 = 13.Slide9
Evaluate the expression.A. 3 36 + 7= 25
B. 21
– 5 + 9
= 18 + 7
= 4 + 9
= 13
3 36 + 7 = 3(6) + 7
21
– 5
+ 9 = 16 + 9Slide10
Evaluate the expression. A. 2 25 + 4= 10
B. 41
– 5 + 5
= 10 + 4
= 6 + 5
= 11
2 25 + 4 = 2(5) + 4
41
– 5
+ 5 = 36 + 5Slide11
Cube rootsCube root – a factor that multiplies by itself three times ExamplesSlide12
Lesson QuizFind the two square roots of each number.1. 81 2. 2500Evaluate each expression.3. 3 16 + 1 4.
7 9 – 2 49
±
9
±
5013
7