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Thread: Maths Brain Fade

  1. #1
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    Maths Brain Fade

    Was studying a little for maths.. in the middle of a question I've hit a brain fade.

    m^2 + 80 = 0.25m^2

    The next step in the answers is

    0.75m^2 = 80

    What did they do to go from there to here?
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  2. #2
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    Quote Originally Posted by Mschumi View Post
    Was studying a little for maths.. in the middle of a question I've hit a brain fade.

    m^2 + 80 = 0.25m^2

    The next step in the answers is

    0.75m^2 = 80

    What did they do to go from there to here?

    $\displaystyle m^2+80=.25m^2$

    Subtract $\displaystyle .25m^2$ from both sides

    $\displaystyle .75m^2+80=0$

    Now subtract 80 from both sides


    Being as this won't be what you posted, I presume you actually meant $\displaystyle m^2-80=.25m^2$ note the - sign
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  3. #3
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    Quote Originally Posted by Mschumi View Post
    Was studying a little for maths.. in the middle of a question I've hit a brain fade.

    m^2 + 80 = 0.25m^2

    The next step in the answers is

    0.75m^2 = 80

    What did they do to go from there to here?
    Subtract $\displaystyle 0.25m^2$ from each side, and add 80 to each side; that is:

    $\displaystyle m^2-80=0.25m^2 \Leftrightarrow m^2-80-0.25m^2 = 0.25m^2-0.25m^2 \Leftrightarrow$ $\displaystyle (1-0.25)m^2-80 = 0 \Rightarrow 0.75m^2=80$
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  4. #4
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    Cheers

    Yup meant to have the $\displaystyle -$.

    Thank You for help.
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