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course phy 121

If your solution to stated problem does not match the given solution, you should self-critique per instructions at

http://vhcc2.vhcc.edu/dsmith/geninfo/labrynth_created_fall_05/levl1_22/levl2_81/file3_259.htm

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Your solution, attempt at solution. If you are unable to attempt a solution, give a phrase-by-phrase interpretation of the problem along with a statement of what you do or do not understand about it. This response should be given, based on the work you did in completing the assignment, before you look at the given solution.

001. typewriter notation

Note that there are six questions in this exercise. Be sure to continue scrolling down until you get to the end of the exercise.

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Question: `q001. Explain the difference between x - 2 / x + 4 and (x - 2) / (x + 4). Then evaluate each expression for x = 2.

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Your solution:

1) x-2/x+4

2-2/2+4

2-1+4

5

2)(x-2)/(x+4)

(2-2)/(2+4)

0/6

6

There is not a difference in the math problems other then the order of operations that you have to do to get the answer to the problem

confidence rating #$&* 3

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Given Solution:

`aThe order of operations dictates that grouped expressions must be evaluated first, that exponentiation must be done before multiplication or division, which must be done before addition or subtraction.

It makes a big difference whether you subtract the 2 from the x or divide the -2 by 4 first. If there are no parentheses you have to divide before you subtract. Substituting 2 for x we get

2 - 2 / 2 + 4

= 2 - 1 + 4 (do multiplications and divisions before additions and subtractions)

= 5 (add and subtract in indicated order)

If there are parentheses you evaluate the grouped expressions first:

(x - 2) / (x + 4) = (2 - 2) / ( 2 + 4 ) = 0 / 6 = 0.

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Self-critique (if necessary): 3/OK

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Self-critique rating #$&* 3/Ok

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Question: `q002. Explain the difference between 2 ^ x + 4 and 2 ^ (x + 4). Then evaluate each expression for x = 2.

Note that a ^ b means to raise a to the b power. This process is called exponentiation, and the ^ symbol is used on most calculators, and in most computer algebra systems, to represent exponentiation.

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Your solution:

2^x+4

2^2+4

4+4

8

2^(x+4)

2^(2+4)

2^6

64

This problem is like #1, there is really no difference other then the order of operations is diffrent

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There are several more questions in this exercise. Please submit the entire document, along with your work and self-critiques. You can just indicate 'already done' on the first two, which look just fine.

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