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Math Help - simplify!

  1. #1
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    simplify!

    please simplify
    (1.2x^3+4.5x^2-3.8x)+(-3.4x^3-4.7x^2+23)
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  2. #2
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    Re: simplify!

    The . indicate decimal points I assume?

    If so simply group and add like terms 1.2x^3+-3.4x^3 = -2.2x^3 do the same for different orders of x
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  3. #3
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    Re: simplify!

    What about this one.....
    -4x(2x^3-6x^2-5x+1)
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  4. #4
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    Re: simplify!

    Quote Originally Posted by Pandatwirler2 View Post
    What about this one.....
    -4x(2x^3-6x^2-5x+1)
    2x^3-6x^2-5x+1 isn't factorable.
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  5. #5
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    Re: simplify!

    Quote Originally Posted by Pandatwirler2 View Post
    What about this one.....
    -4x(2x^3-6x^2-5x+1)
    You can expand the -4x into the bracket here,

    -4x(2x^3-6x^2-5x+1) = -4x\times 2x^3-4x\times-6x^2-4x\times-5x-4x\times 1 = \dots

    Is that what you are after?
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  6. #6
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    Re: simplify!

    yes but how do you multiply -4x with 2x^3?
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  7. #7
    Super Member bigwave's Avatar
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    Re: simplify!

    you multiply the coefficients and add the exponents

    (-4x)(2x^3) = -8x^4
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  8. #8
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    Re: simplify!

    Quote Originally Posted by Pandatwirler2 View Post
    yes but how do you multiply -4x with 2x^3?
    Has you teacher not told you how?
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