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Thread: how do i solve these

  1. #1
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    how do i solve these

    hi i'm reading a precalculus book and I'm very bad at math right now I'm stuck at solving these:
    how do i solve these-math2.jpg
    how do i do it?

    also in here:
    how do i solve these-math.jpg
    how does the last step happen?
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  2. #2
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    Re: how do i solve these



    (b) simplify the $\dfrac{3}{15}$ in the denominator first, then multiply numerator and denominator by the common denominator of all the fractions in the complex fraction ...

    $\dfrac{10}{10} \cdot \dfrac{\frac{2}{5}+\frac{1}{2}}{\frac{1}{10}+\frac {1}{5}} = \dfrac{4+5}{1+2} = \dfrac{9}{3} = 3$


    now, you try the same method with (a)





    $\sqrt{45} = \sqrt{9 \cdot 5} = \sqrt{9} \cdot \sqrt{5} = 3 \sqrt{5}$
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  3. #3
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    Re: how do i solve these

    i got 8 over 3 for (a) is this correct. I think I'm missing a step...
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  4. #4
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    Re: how do i solve these

    Quote Originally Posted by mohsentux View Post
    i got 8 over 3 for (a) is this correct. I think I'm missing a step...
    that would be correct
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  5. #5
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    Re: how do i solve these

    Quote Originally Posted by skeeter View Post
    that would be correct
    YEEEEEEEES I DID IT. I'M THE MASTER. Thanx skeeter.
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