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Math Help - Simplify

  1. #1
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    Simplify

    The #2's after the letter s below represent squared. Not sure how to post it so it looks that way. Let me know if im doing this one right please.

    9m2 -2mn + 5n2 - 9 (5m2 + 6mn - 8n2)

    Step 1: Work whats in parenthesis (multiply)

    -9 x 5m2 = -45m2 -9 x 6mn = -54mn -9 x 8n2 = -72n2

    leaving: 9m2 - 2mn + 5n2 -45m2 - 54mn - 72n2

    Step 2: combine like terms

    9m2 + -45m2 = -36m2 -2mn + - 54mn = -56mn 5n2 + 72n2 = 77n2

    Answer: 54m2 - 56mn +77n2



    Comment on this one please....



    Mr.H
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  2. #2
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    Quote Originally Posted by Mr.Huge View Post
    The #2's after the letter s below represent squared. Not sure how to post it so it looks that way. Let me know if im doing this one right please.

    9m2 -2mn + 5n2 - 9 (5m2 + 6mn - 8n2)

    Step 1: Work whats in parenthesis (multiply)

    -9 x 5m2 = -45m2 -9 x 6mn = -54mn -9 x 8n2 = -72n2

    leaving: 9m2 - 2mn + 5n2 -45m2 - 54mn - 72n2

    Step 2: combine like terms

    9m2 + -45m2 = -36m2
    -2mn + - 54mn = -56mn
    5n2 + 72n2 = 77n2

    Answer: 54m2 - 56mn +77n2
    1. The use of the "=" sign is very unconventional (and mathematically wrong). Better use new lines for separate calculations.

    2. All calculations are correct so far - but the last line. I've marked the terms in question in red.
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  3. #3
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    Quote Originally Posted by earboth View Post
    1. The use of the "=" sign is very unconventional (and mathematically wrong). Better use new lines for separate calculations.

    2. All calculations are correct so far - but the last line. I've marked the terms in question in red.
    ok thank so it should look like this than



    Simplify: 9m2 -2mn + 5n2 - 9 (5m2 + 6mn - 8n2)

    Step 1: Step 1: Work whats in parenthesis (multiply)

    a) -9 x 5m2 -45m2

    b) -9 x 6mn -54mn

    c) -9 x 8n2 -72n2

    Step 2: combine like terms

    a) 9m2 + -45m2 -36m2

    b) -2mn + - 54mn -56mn

    c) 5n2 + 72n2 + 77n2

    Step 3:

    Answer -36m2 - 56mn + 77n2

    Correct? I used the = previously just to show my work via the posting wouldnt have really done that on paper but i understand what you mean. I just wasnt sure how someone would be reading it on here.



    Mr.H
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  4. #4
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    Preview

    In my view, it is advisable to use the preview option before posting.
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  5. #5
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    Quote Originally Posted by Mr.Huge View Post
    ok thank so it should look like this than



    Simplify: 9m2 -2mn + 5n2 - 9 (5m2 + 6mn - 8n2)

    ...

    Answer -36m2 - 56mn + 77n2

    Correct? I used the = previously just to show my work via the posting wouldnt have really done that on paper but i understand what you mean. I just wasnt sure how someone would be reading it on here.

    Mr.H
    Your result is correct

    With my remark about the use of the "=" sign in my previous post I only wanted to point out that the "=" sign is used to state that both sides are equal. If you use the "=" sign to finish a step of calculations then the values on both sides are not equal and the "=" sign shouldn't be used.

    To write a power use this ^ sign: 4^3 = 64
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