In this discussion, you will simplify and compare equivalent expressions written both in radical form and with rational (fractional) exponents. Read the following instructions in order and view the MAT
Week
Discussion Example Download MAT222 Week 3 Discussion Example to complete this discussion. Please complete the following problems according to your assigned number. (Instructors will assign each student their number.)
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INSTRUCTOR GUIDANCE EXAMPLE: Week Three Discussion
Simplifying Radicals
1. Simplify each expression using the rules of exponents and explain the steps you
are taking.
2. Next, write each expression in the equivalent radical form and demonstrate how it
can be simplified in that form, if possible.
3. Which form do you think works better for the simplification process and why?
#51. (2-4)1/2
2
(-4*1/2)
2-2
1
22
The exponent working on an exponent calls for the Power Rule.
The exponents multiply each other.
-4*1/2 = -2 so the new exponent is -2.
The negative exponent makes a reciprocal of base number and
exponent.
The final simplified answer is ¼. This is the principal root of the
square root of 2-4.
1
4
1
81x 12 4
#63. 20
y
4 14 12 14
3 x
1
y 20 4
3x 3
y5
The Power Rule will be used again with the outside exponent
multiplying both the inner exponents. 81 = 34
4*1/4 = 1, 12*1/4 = 3, and 20*1/4 = 5
All inner exponents were multiples of 4 so no rational exponents are left.
2
8 3
#89.
27
First rewrite each number as a prime to a power.
2
23 3
3
3
Use the Power Rule to multiply the inner exponents.
The negative has to be dealt with somewhere so I will put it with
the 2 in the numerator.
23 3
2
3
3
2
3
3*2/3 = 2 in both numerator and denominator.
22 4
32
9
The squaring eliminates the negative for the answer.
It turns out that the examples I chose to work out here didn’t use all of the vocabulary
words and required one which wasn’t on the list. Students should be sure to use words
appropriate to the examples they work on.
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