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Can someone help me answer my homework?

  • Thread starter jlmf_inc
  • Start date
  • #1
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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..
 

Answers and Replies

  • #2
Defennder
Homework Helper
2,591
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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}
What do you understand by the terms "integers" and "irrational numbers"?

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

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
Simply find the common factors of the individual terms and factor them out.
 
  • #3
HallsofIvy
Science Advisor
Homework Helper
41,792
920


How can we "compare" your answers to ours if you don't post your answers?
 
  • #4
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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
 
  • #5
cristo
Staff Emeritus
Science Advisor
8,107
72


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
Your answers don't tally with the questions!
 
  • #6
HallsofIvy
Science Advisor
Homework Helper
41,792
920


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
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".

2a)Associative
2b)Commutative
??? Problem 2 asked you to find 2 sets! You "answers" give properties of operations!

3a) null/empty set
3b) 2,4,6,7
Problem 3 asked you to factor expressions!

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
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?
 
  • #7
441
0


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".
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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