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Math Help - Decimals, Inequalities & Confusion..

  1. #1
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    Decimals, Inequalities & Confusion..

    Hey guys! So, could someone please explain the steps to me on this inequality with decimals, I gave it a try but..my answer did differ from the textbook..Sigh, I wish I just understood all of this and didn't have to stress about this one subject..

    Here it is: 8(2x-0,2) > 0,4+3(-2x-0,1) (correct to 2 dec) -> That's exactly how its written in the textbook.

    Any help would be appreciated!
    Thanks!
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  2. #2
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    Re: Decimals, Inequalities & Confusion..

    Quote Originally Posted by Simimano View Post
    Hey guys! So, could someone please explain the steps to me on this inequality with decimals, I gave it a try but..my answer did differ from the textbook..Sigh, I wish I just understood all of this and didn't have to stress about this one subject..

    Here it is: 8(2x-0,2) > 0,4+3(-2x-0,1) (correct to 2 dec) -> That's exactly how its written in the textbook.

    Any help would be appreciated!
    Thanks!
    I'll assume that the comma is being used for a decimal point. Most people would find it easier to read it like this: \displaystyle \begin{align*} 8(2x - 0.2) > 0.4 + 3(-2x - 0.1) \end{align*}

    Solve inequalities the exact same way you would solve equalities. The only difference is that if you multiply or divide by a negative number, you need to change which way the inequality symbol points. In this case, start by expanding the brackets and simplifying on both sides.
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  3. #3
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    Re: Decimals, Inequalities & Confusion..

    In the answer in the textbook, I don't see where the "correct to 2 decimal" was even used..
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