Thread: Danm Math...

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  1. #1
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    Danm Math...

    So... I got some stuff as math homework. Anyone got a clue?
    Need to write this simpler removing the brackets.

    2(a-3)+5(a+31)

    Need to write it down more easily , teacher isn't a big help.. Since i saw some ppl posting they like math i figured i'd ask

    Don't really need the awnser, just a way to solve these questions





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    Apex?'s Avatar
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    Teachers are always not a big help

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    2(a-3)+5(a+31)=
    (2a -6) + (5a + 155)=
    2a + 5a -6 + 155=
    7a + 149.
    You're really 17? :\
    I'm not trying to offend but i'm 17 and that's 7th grade math for me :\
    Last edited by Youtro; 03-18-2014 at 01:08 PM.



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    Quote Originally Posted by √ince View Post
    I don't understand your question. Can you rephrase it please? Normally I'd be able to do it.
    Well made one in class, this was the right awnser dont ask me how i did it.

    How do i solve such problems?
    It has to be made shorter and remove the (...) So it becomes a simple sum like 7a+149 << the correct awnser on the question.





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    Quote Originally Posted by SammyDoge1 View Post

    Well made one in class, this was the right awnser dont ask me how i did it.

    How do i solve such problems?
    It has to be made shorter and remove the (...) So it becomes a simple sum like 7a+149 << the correct awnser on the question.
    Distribute and add like terms. This is like pre-algebra...
    Formally known as chickeninabiskit

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    That question is way easy.


    ex-
    ex-x2
    ex-

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    Quote Originally Posted by Youtro View Post
    2(a-3)+5(a+31)=
    (2a -6) + (5a + 155)=
    2a + 5a -6 + 155=
    7a + 149.
    You're really 17? :\
    I'm not trying to offend but i'm 17 and that's 7th grade math for me :\
    Maybe for you, but i suck at math, I just don't get how you do that(the steps to follow). Could you give me the steps to walk tho, so i maybe can understand how your doing it?
    Quote Originally Posted by CaT- View Post
    That question is way easy.
    Maybe for you, not everyone is equally good at math you know.





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    Quote Originally Posted by SammyDoge1 View Post

    Well made one in class, this was the right awnser dont ask me how i did it.

    How do i solve such problems?
    It has to be made shorter and remove the (...) So it becomes a simple sum like 7a+149 << the correct awnser on the question.
    You can always vm/pm me if you don't understand something, and guys^ not everyone is good at maths. If he has trouble doing it then he needs to get it explained well. I can always help someone, especially when we speak the same language.

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    Quote Originally Posted by SammyDoge1 View Post

    Maybe for you, but i suck at math, I just don't get how you do that(the steps to follow). Could you give me the steps to walk tho, so i maybe can understand how your doing it?

    Maybe for you, not everyone is equally good at math you know.
    Do you know your order of operations? PEMDAS (Parentheses -> Exponents -> Multiplication -> Division -> Addition -> Substract).

    Equation: 2(a-3)+5(a+31)

    2(a-3) means multiply everything in the parenthethes by 2. You have distribute that 2 to everything inside of the parentheses
    2 * a = 2a
    2 * -3 = -6

    So now you're left with: 2a - 6 + 5(a + 31)

    Once again, 5(a - 31) means multiply everything in the parentheses by 5. Remember distribute a.k.a. FOIL (First-> Inner-> Outer-> Last)!
    5 * a = 5a
    5 * 31 = 155

    So now you're left with: 2a - 6 + 5a - 155

    Simplify and combine like terms:
    2a + 5a = 7a
    -6 + 155 = 149

    Final Answer: 7a + 149

    Here's a video that should explain it very well:

    https://www.khanacademy.org/math/alg...g-polynomials1
    Last edited by Woodhouse; 03-18-2014 at 01:50 PM.
    Formally known as chickeninabiskit

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    Quote Originally Posted by √ince View Post
    You can always vm/pm me if you don't understand something, and guys^ not everyone is good at maths. If he has trouble doing it then he needs to get it explained well. I can always help someone, especially when we speak the same language.
    Exactly.

    Quote Originally Posted by CaT- View Post
    That question is way easy.
    Enlighten me on how to solve such questions.





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    Quote Originally Posted by Woodhouse View Post

    Do you know your order of operations? PEMDAS. Parenthethis -> Exponents -> Multiplication -> Division -> Addition -> Substract
    2(a-3)+5(a+31)

    2(a-3) means multiply everything in the parenthethis by 2. You have distribute that 2 to everything in the paranthesis.

    2 * a = 2a
    2 * -3 = -6

    So now you're left with: 2a - 6 + 5(a + 31)

    Once again, 5(a - 31) means multiply everything in the paranthesis by 5. Remember distribute a.k.a. FOIL (First-> Inner-> Outer-> Last)!

    5 * a = 5a
    5 * 31 = 155

    So now you're left with: 2a - 6 + 5a - 155

    Simplify and combine like terms:

    2a +5a = 7a

    -6 +155 = 149

    Final Answer: 7a + 149

    Here's a video that should explain it very well:

    https://www.khanacademy.org/math/alg...g-polynomials1
    Omg <3 Thankyou So much, it actualy shows me how its done, so you just multiply the number outside the () with the numbers inside?

    So, 3(2a+7) will become 6a+21?

    If im correct?





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    Quote Originally Posted by SammyDoge1 View Post


    Omg <3 Thankyou So much, it actualy shows me how its done, so you just multiply the number outside the () with the numbers inside?

    So, 3(2a+7) will become 6a+21?

    If im correct?
    Yes. You are correct. Distribute the outside term with ALL terms inside of the parentheses. The outside number isn't always just a number, but the same principal applies e.g.

    2x(a² + -4a + 4) =
    2xa² - 8xa + 8x

    Last edited by Woodhouse; 03-18-2014 at 01:57 PM.
    Formally known as chickeninabiskit

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    2(a+b)=2a + 2b.
    Pathetic



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    Quote Originally Posted by Woodhouse View Post

    Yes. You are correct. Distribute the outside term with ALL terms inside of the parentheses. The outside number isn't always just a number, but the same principal applies e.g.

    2x(a² + -4a + 4) =
    2xa² - 8xa + 8x

    Cool Cool, Thanks for the explanation! Think i get it now.

    Quote Originally Posted by Youtro View Post
    2(a+b)=2a + 2b.
    Pathetic
    Lol, Its kinda hard to understand if you get 2(a-3)+5(a+31) And the awnser from the teacher, without any explanation.. If you'd told me it in this way, i would have come a far way. thanks i guess..





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