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Math Help - Are these correct?

  1. #1
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    Are these correct?

    Did I do these problems right? I just wanted to be sure.

    Ignore number 7, I found out that one is correct. Sorry for my crappy handwriting, I tried to write these as neat as possible.

    Scanned image..
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  2. #2
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    check your answer in 6.
    u should get -2\left ( x-4 \right )\left ( x-3 \right ).
    answer 7,Yes.
    Check ur answer in 8,u should get -5x^2+5x-4.
    Check ur answer in 9, u should get 6x^3-5x^2-16x+15.
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  3. #3
    Senior Member Stroodle's Avatar
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    Also, the slope of the first one is \frac{9}{2} not -\frac{9}{2} as a negative divided by a negative yields a positive
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  4. #4
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    Thanks guys. Now to go back and see where I did wrong.
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  5. #5
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    Sorry to double post but...

    I looked at the answers you gave me to see where I messed up. I see where I messed up on 8 and 9 (I mixed up the signs), but i'm not getting how you got that answer for 6.
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  6. #6
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    Quote Originally Posted by SailorCardKnight View Post
    Sorry to double post but...

    I looked at the answers you gave me to see where I messed up. I see where I messed up on 8 and 9 (I mixed up the signs), but i'm not getting how you got that answer for 6.
    You start here:
    -2x^2+14x-24 and then the next step isn't correct:

    -(2x^2-14x+24) = -(2x^2-8x-6x+24)

    -(2x(x-4)-6(x-4))

    I'll leave the rest for you.
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  7. #7
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    first you didn't factorize well with -1.
    -2x^2+14x-24=-1(2x^2-14x+24)
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  8. #8
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    *smacks forehead*

    Now I get what I did wrong, thanks guys.
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  9. #9
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    also why not factorizing with -2
    -2(x^2-7x+12) = =-2(x-4)(x-3).
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