Results 1 to 13 of 13

Math Help - Out Sick: Practice Problem Help

  1. #1
    Newbie
    Joined
    Dec 2011
    Posts
    6

    Out Sick: Practice Problem Help

    Hello, I was hoping to get some help solving these practice equations from my Algebra class. I have been out sick from my class for a week and a half while we worked on square roots and quadratic equations and I have missed everything and have no idea how to solve them. Any help is appreciated, I'll list the problems below! (Also, I'm not sure how to do superscript on here so if something is squared or cubed I will write that next to it in parenthesis.)
    Thank you!

    x(3x+2)(x-6)=0

    3x(squared)=-4x

    2x(squared)+x-3=0

    x(squared)-2x+2=0

    -x(squared)-6x=2
    Follow Math Help Forum on Facebook and Google+

  2. #2
    MHF Contributor
    skeeter's Avatar
    Joined
    Jun 2008
    From
    North Texas
    Posts
    11,758
    Thanks
    493

    Re: Out Sick: Practice Problem Help

    Quote Originally Posted by Kristeniscrazy View Post
    Hello, I was hoping to get some help solving these practice equations from my Algebra class. I have been out sick from my class for a week and a half while we worked on square roots and quadratic equations and I have missed everything and have no idea how to solve them. Any help is appreciated, I'll list the problems below! (Also, I'm not sure how to do superscript on here so if something is squared or cubed I will write that next to it in parenthesis.)
    Thank you!

    x(3x+2)(x-6)=0

    3x(squared)=-4x

    2x(squared)+x-3=0

    x(squared)-2x+2=0

    -x(squared)-6x=2
    go to the link on solving quadratic equations using various methods.

    Solving Quadratic Equations: Solving by Factoring
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Master Of Puppets
    pickslides's Avatar
    Joined
    Sep 2008
    From
    Melbourne
    Posts
    5,236
    Thanks
    28

    Re: Out Sick: Practice Problem Help

    for the first one, use the null factor law, for the rest factor them, then apply the null facotr law.
    Follow Math Help Forum on Facebook and Google+

  4. #4
    Newbie
    Joined
    Dec 2011
    Posts
    6

    Re: Out Sick: Practice Problem Help

    Thank you, but I'm still having trouble factoring these. Especially the 5th one.
    Follow Math Help Forum on Facebook and Google+

  5. #5
    Master Of Puppets
    pickslides's Avatar
    Joined
    Sep 2008
    From
    Melbourne
    Posts
    5,236
    Thanks
    28

    Re: Out Sick: Practice Problem Help

    -x^2-6x=2

    0=x^2+6x+2

    Now you can complete the square, take the coeffeicent of x, half it then square it, this will be your new constant term.

    What do you get?
    Follow Math Help Forum on Facebook and Google+

  6. #6
    Newbie
    Joined
    Dec 2011
    Posts
    6

    Re: Out Sick: Practice Problem Help

    Oh sorry, I meant the fifth one... I'm having trouble finding how the factors go with two. Since 2 is prime and the negative indicates that the factors have to have different signs. Idk, maybe I'm going about it wrong.

    EDIT: The FOURTH one!! Sorry...
    Follow Math Help Forum on Facebook and Google+

  7. #7
    Master Of Puppets
    pickslides's Avatar
    Joined
    Sep 2008
    From
    Melbourne
    Posts
    5,236
    Thanks
    28

    Re: Out Sick: Practice Problem Help

    I believe I did give some advice for the 5th question

    Quote Originally Posted by Kristeniscrazy View Post

    x(3x+2)(x-6)=0 1st

    3x(squared)=-4x 2nd

    2x(squared)+x-3=0 3rd

    x(squared)-2x+2=0 4th

    -x(squared)-6x=2 5th
    Follow Math Help Forum on Facebook and Google+

  8. #8
    Newbie
    Joined
    Dec 2011
    Posts
    6

    Re: Out Sick: Practice Problem Help

    Sorry, I edited the above post. I actually meant the fourth one but I kept typing fifth... On my sheet it is number five so I'm getting confused.
    Follow Math Help Forum on Facebook and Google+

  9. #9
    Master Of Puppets
    pickslides's Avatar
    Joined
    Sep 2008
    From
    Melbourne
    Posts
    5,236
    Thanks
    28

    Re: Out Sick: Practice Problem Help

    I'm confused as well!

    Not to worry, for the 4th problem you'll have to complete the square. Follow the advice in post #5.
    Follow Math Help Forum on Facebook and Google+

  10. #10
    Newbie
    Joined
    Dec 2011
    Posts
    6

    Re: Out Sick: Practice Problem Help

    Okay... I think I've solved 4 & 5.

    4. x=1(plus or minus)the square root of 3
    5. x=-3(plus or minus) the square root of seven

    Is that right? If not perhaps I can show my work and figure out what I did wrong.
    Follow Math Help Forum on Facebook and Google+

  11. #11
    Master Of Puppets
    pickslides's Avatar
    Joined
    Sep 2008
    From
    Melbourne
    Posts
    5,236
    Thanks
    28

    Re: Out Sick: Practice Problem Help

    I found the smae for Q5, looks like you are on the right track. Q4 might have complex solutions.
    Follow Math Help Forum on Facebook and Google+

  12. #12
    Newbie
    Joined
    Dec 2011
    Posts
    6

    Re: Out Sick: Practice Problem Help

    Thank you so much for your help! I'm starting to understand a bit better. Ok, so for the third one would I do the same except divide out the 2 in the beginning?
    Follow Math Help Forum on Facebook and Google+

  13. #13
    Master Of Puppets
    pickslides's Avatar
    Joined
    Sep 2008
    From
    Melbourne
    Posts
    5,236
    Thanks
    28

    Re: Out Sick: Practice Problem Help

    I don't think that would help.

    Maybe look for a solution in the form 2x^2+x-3 = (2x+a)(x+b)
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Very Hard Practice Problem
    Posted in the Trigonometry Forum
    Replies: 2
    Last Post: June 8th 2010, 06:06 PM
  2. Calculus AB AP test practice problem
    Posted in the Calculus Forum
    Replies: 1
    Last Post: December 11th 2008, 01:46 PM
  3. Help Im Sick And Cant Think
    Posted in the Trigonometry Forum
    Replies: 2
    Last Post: March 21st 2008, 07:20 AM
  4. calc practice problem
    Posted in the Calculus Forum
    Replies: 2
    Last Post: October 20th 2007, 02:17 PM

Search Tags


/mathhelpforum @mathhelpforum