Mixed and entire radicals
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Mixed and Entire Radicals. Expressing Entire Radicals as Mixed Radicals, and vice versa. Today’s Objectives. Students will be able to demonstrate an understanding of irrational numbers by: Expressing a radical as a mixed radical in simplest form (limited to numerical radicands)

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Mixed and Entire Radicals

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Mixed and entire radicals

Mixed and Entire Radicals

Expressing Entire Radicals as Mixed Radicals, and vice versa


Today s objectives

Today’s Objectives

  • Students will be able to demonstrate an understanding of irrational numbers by:

    • Expressing a radical as a mixed radical in simplest form (limited to numerical radicands)

    • Expressing a mixed radical as an entire radical (limited to numerical radicands)


Proportions

Proportions

  • Recall that we can name fractions in many different ways and they will be equivalent to each other, or proportional to each other

  • For example, all of the following fractions are equivalent to the fraction 3/12:

    1/4 , 5/20 , 30/120 , 100/400

  • Why is ¼ the simplest form of 3/12?


Equivalent expressions

Equivalent expressions

  • Just as with fractions, equivalent expressions for any number have the same value

  • Example:

    • √16*9 is equivalent to √16 * √9 because,

      • √16*9 = √144 = 12 and √16 * √9 = 4*3 = 12

    • Similarly, 3√8*27 is equivalent to 3√8 * 3√27 because,

      • 3√8*27 = 3√216 = 6 and 3√8 * 3√27 = 2*3 = 6

  • Multiplication Property of Radicals

  • n√ab = n√a * n√b, where n is a natural number, and a and b are real numbers


Multiplication property

Multiplication Property

  • We can use this property to simplify square roots and cube roots that are not perfect squares or perfect cubes

  • We can find their factors that are perfect squares or perfect cubes

  • Example: the factors of 24 are: 1,2,3,4,6,8,12,24

    • We can simplify √24 because 24 has a perfect square factor of 4.

    • Rewrite 24 as the product of two factors, one being 4

    • √24 = √4*6 = √4*√6 = 2*√6 = 2√6

    • We can read 2√6 as “2 root 6”.


Multiplication property1

Multiplication Property

  • Similarly, we can simplify 3√24 because 24 has a perfect cube factor of 8.

    • Rewrite 24 as the product of two factors, one being 8

    • 3√24 = 3√8*3 = 3√8 *3√3 = 23√3

    • We can read this as “2 cube root 3”.

  • However, we cannot simplify 4√24 because 24 has no factors that can be written as a 4th power

  • We can also use prime factorization to simplify a radical


Example 1 simplifying radicals using prime factorization

Example 1) Simplifying Radicals Using Prime Factorization

  • Simplify the radical √80

  • Solution:

    • √80 = √8*10 = √2*2*2*5*2

    • = √(2*2)*(2*2)*5 = √4*√4*√5

    • =2*2*√5

    • 4√5

  • Your turn:

    • Simplify the radical 3√144

    • Simplify the radical 4√162

    • = 23√18, 34√2


Multiple answers

Multiple Answers

  • Some numbers, such as 200, have more than one perfect square factor

  • The factors of 200 are: 1,2,4,5,8,10,20,25,40,50,100,200

  • Since 4, 25, and 100 are perfect squares, we can simplify √200 in three ways:

    • 2√50, 5√8, 10√2

    • 10√2 is in simplest form because the radical contains no perfect square factors other than 1.

  • So, to write a radical of index n in simplest form, we write the radicand as a product of 2 factors, one of which is the greatest perfect nth power


Example 2 writing radicals in simplest form

Example 2) Writing Radicals in Simplest Form

  • Write the radical in simplest form, if possible.

    • 3√40

  • Solution:

    • Look for the perfect nth factors, where n is the index of the radical.

    • The factors of 40 are: 1,2,4,5,8,10,20,40

    • The greatest perfect cube is 8 = 2*2*2, so write 40 as 8*5.

    • 3√40 = 3√8*5 = 3√8*3√5 =

    • 23√5

  • Your turn:

    • Write the radical in simplest form, if possible.

      • √26, 4√32

      • Cannot be simplified, 24√2


Mixed and entire radicals1

Mixed and Entire Radicals

  • Radicals of the form n√x such as √80, or 3√144 are entire radicals

  • Radicals of the form an√x such as 4√5, or 23√18 are mixed radicals

  • We already rewrote entire radicals as mixed radicals in Examples 1 and 2

  • Here is one more example going the opposite way (mixed radical  entire radical)


Example 3 writing mixed radicals as entire radicals

Example 3) Writing Mixed Radicals as Entire Radicals

  • Write the mixed radical as an entire radical

    • 33√2

  • Solution:

    • Write 3 as: 3√3*3*3 = 3√27

    • 33√2 = 3√27 * 3√2 = 3√27*2 =

    • 3√54

  • Your turn:

    • Write each mixed radical as an entire radical.

    • 4√3, 25√2

    • √48, 5√64


Review

Review

  • Multiplication Property of Radicals is:

    • n√ab = n√a * n√b, where n is a natural number, and a and b are real numbers

  • to write a radical of index n in simplest form, we write the radicand as a product of 2 factors, one of which is the greatest perfect nth power

  • Radicals of the form n√x such as √80, or 3√144 are entire radicals

  • Radicals of the form an√x such as 4√5, or 23√18 are mixed radicals


Homework

Homework

  • Pg. 218 - 219

    • (4-5)aceg, 7a, 9, 11acegi, 14,17,19, 21, 24


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