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Section 2.7 Alg.1

Section 2.7 Alg.1. How do you evaluate a square root?. Review…. 3(4x + 1) = (5x – 3)4 = x(4x + 7) =. Review…. 5(x + 4) – 3x = 7 –(6x – 9) =. Review. Multiplicative inverse is really just multiplying by what…..

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Section 2.7 Alg.1

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  1. Section 2.7Alg.1 How do you evaluate a square root?

  2. Review… 3(4x + 1) = (5x – 3)4 = x(4x + 7) =

  3. Review… • 5(x + 4) – 3x = • 7 –(6x – 9) =

  4. Review.. • Multiplicative inverse is really just multiplying by what….. • What is the difference between additive inverse and multiplicative inverse? • What number are we trying to get when we multiply a number and it’s multiplicative inverse?

  5. Check up quiz…

  6. On a piece of paper…. • -7(2x - 6) = • x(x – 8) = • 9-(3x + 2) = • What is the multiplicative inverse of -6? • What is the multiplicative inverse of ?

  7. How do you read…

  8. Squared Vs. Square Rootds …. Is equal to 9…. but so is The square roots of 9 are 3 and (-3) All positive real numbers have two square roots: a positive and a negative

  9. How am I written? • A square root is written with a radical symbol….. √ . The number under the radical symbol is the RADICAND.

  10. What about zero? • The square root only has one square root…….. ZERO

  11. Evaluate the expressions… • ± √ 36 = • √ 49 = • - √ 36 = • √ - 36 =

  12. Square root of a negative... • What two (same) numbers could you multiply together to get a negative number….. • You can’t take the square root of a negative number…. Because it wouldn’t be a real number… • In further math classes…this is called an imaginary number---it doesn’t exist!

  13. Perfect Square… 9 • The square of an integer is called the perfect square. • What does it mean to be an integer? 9

  14. Approximating the square root to the nearest integer…. • ± √ 39 • ± √15 • ± √ 51

  15. Word Problems… • If you want to buy a square wall poster of the CHICAGO CUBS….That has an area of 225 square feet. Find the side length of the wall poster! ? ?

  16. Homework… • 2.7 Worksheet!

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