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Math Help - please help me understand these problems.

  1. #1
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    Question please help me understand these problems.

    radical

    #1.√x : 25 = 3:5 find x?


    a) 625
    B)5
    c) 25
    D) 15

    #2.√2 (√32 - √2 )

    a)8√2 b) 6 c)√60 d) 4


    #3.( 5√2)^2

    a) 50 b) 100 c)20 d) 40

    #4 simplify √90

    a) 9√10 b)30 c)3√10 d)10√3

    #5 rationalize the denominator
    √5/8

    a) √40/64 b)√40/8 c) √10/2 d) √10/4
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  2. #2
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    Quote Originally Posted by BeBeMala View Post
    radical

    #1.√x : 25 = 3:5 find x?
    What have you tried? These are ratios.

    \frac{\sqrt{x}}{25}=\frac{3}{5}

    \sqrt{x}=\frac{3}{5}\cdot 25 = 3\cdot 5 = 15

    Can you take it from there?

    #2.√2 (√32 - √2 )
    Have you considered multiplication? \sqrt{64} - \sqrt{4}

    Can you take it from there?

    #3.( 5√2)^2
    Have you considered squaring? 5^{2}\cdot \sqrt{2}^{2} = 25 \cdot 2

    Can you take it form there?

    #4 simplify √90
    Have you considered prime factorization?

    Let's see your work. Have you made any efforts? Do you want the volunteers, here, to do all your homework or take your exam? Give us a clue where you are and how we can help you.
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  3. #3
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    Unhappy

    Quote Originally Posted by TKHunny View Post
    What have you tried? These are ratios.

    \frac{\sqrt{x}}{25}=\frac{3}{5}

    \sqrt{x}=\frac{3}{5}\cdot 25 = 3\cdot 5 = 15

    Can you take it from there?



    Have you considered multiplication? \sqrt{64} - \sqrt{4}

    Can you take it from there?



    Have you considered squaring? 5^{2}\cdot \sqrt{2}^{2} = 25 \cdot 2

    Can you take it form there?



    Have you considered prime factorization?

    Let's see your work. Have you made any efforts? Do you want the volunteers, here, to do all your homework or take your exam? Give us a clue where you are and how we can help you.
    sorry I didn't understand nothing at all.thank you for your help anyways.
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  4. #4
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    This leads to other questions:

    1) Why are you studying this material?
    2) Do you have a class, a book, a teacher?
    3) Is this a placement test? If so, you will not be testing past pre-algebra.
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  5. #5
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    Question

    Quote Originally Posted by TKHunny View Post
    This leads to other questions:

    1) Why are you studying this material?
    2) Do you have a class, a book, a teacher?
    3) Is this a placement test? If so, you will not be testing past pre-algebra.

    i'm study this material for a test. i did understand everything when the teacher explain it, but now i'm loss
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  6. #6
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    Quote Originally Posted by BeBeMala View Post
    i'm study this material for a test. i did understand everything when the teacher explain it, but now i'm loss
    Then you are not "understanding everything when the teacher explains it". it is very easy to watch someone solve a problem and think that you understand when you don't. Ask your teacher to watch you solve some problems.
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  7. #7
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    BeBe, do you understand that [SQRT(x)]^2 = x ?
    Like, if your teacher simply told you that, chances are
    you'll soon forget IF you did not understand why.

    SQRT(9) = 3 ; 3^2 = 9
    [SQRT(9)]^2 = 9
    Do you "see" that?
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