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Math Help - factorising cubic

  1. #1
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    factorising cubic

    16x^2+6x^2+28x=0

    How would you factorise this? ]CHeers
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  2. #2
    A riddle wrapped in an enigma
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    Quote Originally Posted by Haris View Post
    16x^2+6x^2+28x=0

    How would you factorise this? ]CHeers
    Hi Haris,

    Are you sure you copied this correctly?

    You have 16x^2+6x^2+28x
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  3. #3
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    Aye thats it...
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  4. #4
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    I think the reason why he is questioning whether or not you copied it correctly is because the exponents of the first two terms is the same. If thats the case, you can just combine the first two terms. It is usually not that easy =P
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  5. #5
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    Hello Haris
    Quote Originally Posted by Haris View Post
    16x^2+6x^2+28x=0

    How would you factorise this? ]CHeers
    Judging from the title of your post, I suspect you might mean:
    16x^3+6x^2+28x = 0
    If so, take out a factor 2x:
    2x(8x^2+3x+14)=0
    That's all the factorising that's possible. And the only real solution to the equation is x = 0.

    Grandad
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