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Can someone help me answer my homework?

  1. Jul 22, 2008 #1
    Can someone help me answer my homework??

    1. List the elements of the given set that are:
    (a)integers
    (b)irrational numbers

    {0,-10,50,22/7,0.538,square root of 7,1.233..., -1/3, 3 roots of 2}

    2. Find the indicated set if:
    A={1,2,3,4,5,6,7}
    B={2,4,6,8}
    C={7,8,9,10}

    (a) A intersect B intersect C
    (b) A intersect (B Union C)


    3. Factor the following expression completely:

    (a) x^-3/2 +2x^-1/2 + x^1/2
    (b) 3x^2(4x-12)^2 + x^3(2)(4x-12)(4)
    (c) x^3 + 2x^2 + x


    please response to the questions ASAP tnx..
     
  2. jcsd
  3. Jul 22, 2008 #2

    Defennder

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    Re: Can someone help me answer my homework??

    What do you understand by the terms "integers" and "irrational numbers"?

    What elements do the sets [tex]A \cap B[/tex] and [tex]A \cup B[/tex] comprise of?

    Simply find the common factors of the individual terms and factor them out.
     
  4. Jul 22, 2008 #3

    HallsofIvy

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    Re: can anyone help me answer as i comapre mine to you??

    How can we "compare" your answers to ours if you don't post your answers?
     
  5. Jul 25, 2008 #4
    Re: Can someone help me answer my homework??

    Here are my answers, will anyone bother to check my answers.

    1a) 0,-10,50
    1b)22/7, square root of 7, 3 roots of 2

    2a)Associative
    2b)Commutative

    3a) null/empty set
    3b) 2,4,6,7

    4a) (-2,1]
    4b) (-1,infinite)

    5.) 5-10t+t^3+-t^2-t^4

    6.) (6y-7)(y+3)

    7.) (4z-3)(4z-3)

    8.) X^-3/2(X+1)^2

    9.) 16x^2(x-3)(5x-9)

    10.) x(x+1)^2
     
  6. Jul 25, 2008 #5

    cristo

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    Re: Can someone help me answer my homework??

    Your answers don't tally with the questions!
     
  7. Jul 25, 2008 #6

    HallsofIvy

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    Re: Can someone help me answer my homework??

    You are going to make us go back and forth between your list of questions above and answers here? it would have been far simpler to copy your previous post and then add your answer to it!

    22/7 is NOT an irrational number. Since it is a fraction it is by definition rational. By the way, I would interpret "3 roots of 2" as "3 times the square root of 2" but I suspect here you mean "cube root of 2".

    ??? Problem 2 asked you to find 2 sets! You "answers" give properties of operations!

    Problem 3 asked you to factor expressions!

    There are no problems 4- 10 in your original post! How can we now tell you if these are correct answers if you tell us what the problems are?
     
  8. Jul 25, 2008 #7
    Re: Can someone help me answer my homework??

    Well either way we know it is irrational. But you are right 3 roots of 2 is an odd way of saying either option.
     
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