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Simplifying Higher Order Roots[InClass Version][Algebra 1 Honors].notebook
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September 19, 2017
Sep 48:37 AM
Homework Assignment
The following examples have to be copied for next class
Example 1
Example 2
Example 3
Example 4
Example 5
Example 6
Example 7
Example 8
Example 9
The examples must be copied and ready for me to check once you come to class.
Simplifying Higher Order Roots[InClass Version][Algebra 1 Honors].notebook
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September 19, 2017
Jul 196:13 PM
Simplifying Higher Order Roots
The expression above is read as the “nth root of b”. Too find a real number that when multiplied with itself "n" times the product is equal to "b",where n is the index.
Simplifying Higher Order Roots[InClass Version][Algebra 1 Honors].notebook
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First 10 Perfect Cubes
Simplifying Higher Order Roots[InClass Version][Algebra 1 Honors].notebook
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First 10 Perfect Cube Root
Simplifying Higher Order Roots[InClass Version][Algebra 1 Honors].notebook
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First 5 Perfect Fourths
Simplifying Higher Order Roots[InClass Version][Algebra 1 Honors].notebook
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First 5 Perfect Fourth Roots
Simplifying Higher Order Roots[InClass Version][Algebra 1 Honors].notebook
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First 5 Perfect Fifths
Simplifying Higher Order Roots[InClass Version][Algebra 1 Honors].notebook
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First 5 Perfect Fifth Roots
Simplifying Higher Order Roots[InClass Version][Algebra 1 Honors].notebook
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Example 1
Evaluate :
SOLUTION
Looking for a number that when multiplied by itself 3 times is equal to 64.
4
Simplifying Higher Order Roots[InClass Version][Algebra 1 Honors].notebook
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September 19, 2017
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Example 2
Evaluate :
SOLUTION
If the negative sign is NOT inside the radical just take the cube root of 64, and keep the negative sign.
– 4
From that last example the cube root of 64 is 4.
–(4)
Simplifying Higher Order Roots[InClass Version][Algebra 1 Honors].notebook
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Example 3
Evaluate :
SOLUTION
Looking for a number that when multiplied by itself 3 times is equal to –64.
If the index is ODD it is possible to have a negative number under the radical expression. Their is a real number that satisfies this expression.
– 4If a negative number is multiplied an ODD number of times the assuming no other mathematical operations the product will be a NEGATIVE number.
Simplifying Higher Order Roots[InClass Version][Algebra 1 Honors].notebook
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Example 4
Evaluate :
SOLUTION
Looking for a number that when multiplied by itself 4 times is equal to –16.
If the index is EVEN it is NOT possible to have a negative number under the radical expression. Their is a real number that satisfies this expression.
If a negative number is multiplied an EVEN number of times the assuming no other mathematical operations the product will be a POSITIVE number.
NO SOLUTIONIf the index is even and higher than 2 the answer is NO SOLUTION.
Unlike when there is a negative number under a square root the answer is NO REAL SOLUTION.
Simplifying Higher Order Roots[InClass Version][Algebra 1 Honors].notebook
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Jul 196:45 PM
Simplifying & Evaluating higer order
roots that are not perfect roots.
1. Rewrite the number under the radical as the product of two factors. Very important one of
the factors has to be a PERFECT ROOT
(never use 1 as your perfect root factor).
*[If there is more than 1 perfect root factor use the largest one.]
2. Give each factor it’s own radical.
3. Simplify the perfect roots, and rewrite the expression.
Simplifying Higher Order Roots[InClass Version][Algebra 1 Honors].notebook
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Example 5
Evaluate :
SOLUTION
The number 40 is not a PERFECT CUBE.
From now on instead of listing all the factors of a number. This example will show you how to get the largest perfect square factor if there is one.
Divide 40 by every perfect cube integer that is less than 40. If the perfect cube integer is a factor when we divide the remainder will be zero.
The largest perfect cube integer than is less than 40 is 27. Start with 27 and continue this process until a perfect cube factor is found or we get to the number one.
Simplifying Higher Order Roots[InClass Version][Algebra 1 Honors].notebook
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First 10 Perfect Cube Integers
Simplifying Higher Order Roots[InClass Version][Algebra 1 Honors].notebook
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The remainder is not zero so 27 is not a perfect cube factor so now try 8.
The remainder is zero so 8 is a perfect square factor of 40.
Use the factors of :
Simplifying Higher Order Roots[InClass Version][Algebra 1 Honors].notebook
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Example 6
Evaluate :
SOLUTION
The number 96 is not a PERFECT FIFTH.
Divide 96 by every perfect cube integer that is less than 96. If the perfect fifth integer is a factor when we divide the remainder will be zero.
The largest perfect fifth integer than is less than 96 is 32. Start with 32 and continue this process until a perfect cube factor is found or we get to the number one.
The index is ODD so it is possible to have real number solution even if there is a negative number under the radical.
Simplifying Higher Order Roots[InClass Version][Algebra 1 Honors].notebook
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The remainder is zero so 32 is a perfect fifth factor of 96.
Use the factors of :
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The 2nd term will be a power that has an exponent that is the difference of the original exponent and the exponent of the 1st term.
The 1st term will be a power that has an exponent that is the largest multiple of the index that is less than or equal to the original exponent.
Rewrite an expression that is a product of two powers, if possible.
Simplifying variable expressions under a higher order radical.
Simplifying Higher Order Roots[InClass Version][Algebra 1 Honors].notebook
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EXAMPLE 7
Simplify :
SOLUTIONRewrite an expression that is a product of two powers, if possible.
The 1st term will be the highest multiple of 3, that is less than or equal to 14 is 12.
Simplifying Higher Order Roots[InClass Version][Algebra 1 Honors].notebook
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Simplify the 1st radical expression by dividing the exponent by the index.
The 2nd term will be the difference between the original exponent 14 and the exponent of the 1st term 12. The exponent of the 2nd term will be 2.
Simplifying Higher Order Roots[InClass Version][Algebra 1 Honors].notebook
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EXAMPLE 8
Simplify :
SOLUTION
This expression cannot be simplified further the index is larger than the exponent.
Simplifying Higher Order Roots[InClass Version][Algebra 1 Honors].notebook
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Example 9
Simplify :
SOLUTION
Rewrite an expression that is a product of two powers, if possible.