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Thread: factoring polynomials - I have been stuck for a while

  1. #1
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    factoring polynomials - I have been stuck for a while

    2.x9 + 1


    3. 2m4 - 2mn3

    4. 3a4 + 81a

    B. Can These Be Factored using the methods (GCF, squares, cubes) discussed in thislesson? Yes or No? Explain why or why not in a complete sentence?
    5. 7x5 - 64y

    6. a4 + 1

    7. a4 64

    C. Factor completelyusing Grouping
    8. xy 5y 2x + 10

    9. x3 + x2 -x 1

    D. Apply Your Knowledge
    10. Suppose a football iskicked from the ground and its height, h, in feet above the ground is given byh = -3.9t2 + 15.6t.
    The time, t, represents thenumber of seconds after the ball is kicked. At what time does the football hitthe ground?
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    Re: factoring polynomials - I have been stuck for a while

    Where are you stuck?
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    Re: factoring polynomials - I have been stuck for a while

    everything after number four... I figured it out up to there.
    Thanks from topsquark
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    Re: factoring polynomials - I have been stuck for a while

    Let's take a look at 5.
    7x^5 - 64y
    Can we factor anything common from both terms? No.

    Is this in the forms
    $\displaystyle a^2 - b^2 = (a + b)(a - b)$ Nope.

    $\displaystyle a^3 + b^3 = (a + b)(a^2 - ab + b^2)$ Nope.

    $\displaystyle a^3 - b^3 = (a - b)(a^2 + ab + b^2)$ Nope.

    So you can't factor it by any means that you have been told to check.

    Try the other ones and get back to us.

    -Dan
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