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    vee123's Avatar
    vee123 Posts: 3, Reputation: 1
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    #1

    Jan 30, 2012, 01:16 PM
    factor each polynomial as possible
    -16x2-48x-36

    I keep getting (4x 8x 6)(-4x-8-6)
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    vee123 Posts: 3, Reputation: 1
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    #2

    Jan 30, 2012, 01:18 PM
    Factor each polynomial as possible
    81m4-16

    Is it prime?
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    vee123 Posts: 3, Reputation: 1
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    #3

    Jan 30, 2012, 01:19 PM
    Factor each polynomial as possible
    4w2-256

    I got (2w-16)(2w 16)
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    ebaines Posts: 12,131, Reputation: 1307
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    #4

    Jan 30, 2012, 01:45 PM
    Quote Originally Posted by vee123 View Post
    -16x2-48x-36

    i keep getting (4x 8x 6)(-4x-8-6)
    Startig with:



    you can divide through by -4:



    Now note that the factors of 4 are either 1 & 4 or 2 & 2, and factors of 9 are either 1 & 9 or 3 & 3. One set of combinations of these factors add to 12. Post back if you're still having trouble - show us what you tried and we'll help you along.
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    ebaines Posts: 12,131, Reputation: 1307
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    #5

    Jan 30, 2012, 01:49 PM
    Quote Originally Posted by vee123 View Post
    4w2-256

    i got (2w-16)(2w 16)
    If you mean 4w^2 -256, and your answer is (2w-16)(2w+16) then yes, that's it. It's a difference of two squares.

    Please note: if you copy and paste equations from other applications they don't turn out correctly, and so please type out the equations. Also, it is customary to use the carat sybol "^" to signify a power. Thus w^2 means "w squared."
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    ebaines Posts: 12,131, Reputation: 1307
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    #6

    Jan 30, 2012, 01:49 PM
    Quote Originally Posted by vee123 View Post
    81m4-16

    is it prime?
    81m^4-16 looks like a diference of two squares to me.
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