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Math Help - [SOLVED] Expanding brackets and Simplyfying

  1. #1
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    [SOLVED] Expanding brackets and Simplyfying

    How can I simplyfy this:

    4x(x+3)+4x2+x

    and this:

    c2 X 4cb

    and this:

    -9z(z3 - 4z+5)

    Thank you!!!!!!!!!!!!
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  2. #2
    Senior Member topher0805's Avatar
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    Quote Originally Posted by Shandy View Post
    How can I simplyfy this:

    4x(x+3)+4x2+x

    and this:

    c2 X 4cb

    and this:

    -9z(z3 - 4z+5)

    Thank you!!!!!!!!!!!!
    <br />
4x(x+3) + 4x^2 + x<br />

    Multiply:

    4x^2 + 12x + 4x^2 + x

    Add common terms:

    <br />
8x^2 + 13x

    Factor:

    x(8x+13)

    -----------------------------

    c2 X 4cb <------ You need to clarify this.

    -----------------------------

    -9z(z^3 - 4z+5)

    Multiply:

    -9z^4 + 36z^2 - 45z

    Factor:

    <br />
-z(9z^3 - 36z + 45)
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  3. #3
    A riddle wrapped in an enigma
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    Quote Originally Posted by Shandy View Post
    How can I simplyfy this:

    4x(x+3)+4x2+x

    and this:

    c2 X 4cb

    and this:

    -9z(z3 - 4z+5)

    Thank you!!!!!!!!!!!!
    Hi Shandy,

    Distribute the 4x in the first one and then combine like terms.

    4x(x+3)+4x^2+x=4x^2+12x+4x^2+x=8x^2+13x

    In the second one,

    c^2 \cdot 4cb=4c^3b

    And the third one,

    -9z(z^3 - 4z+5)=-9z^4+36z^2-45z

    Remember the rule a^m \cdot a^n=a^{m+n}
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