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shannonaaa

  • 3 years ago

Factor: x2 - 9x + 12

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  1. Study23
    • 3 years ago
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    Well, the outer terms have to equal 12. The inner terms have to add to equal -9. What options do you have?

  2. shannonaaa
    • 3 years ago
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    A. (x + 1)(x - 12) B. (x + 2)(x + 6) C. (x - 2)(x - 6) D. prime

  3. Study23
    • 3 years ago
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    It's prime. None of the other options produce -9x when the inside and outside terms are added together.... Does that make sense to you?

  4. shannonaaa
    • 3 years ago
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    yes, thank you (:

  5. UnkleRhaukus
    • 3 years ago
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    \[(x + 1)(x - 12)=x^2-11x-12\neq x^2 - 9x + 12\] \[(x + 2)(x + 6)=x^2+8x+12\neq x^2 - 9x + 12\] \[(x - 2)(x - 6)=x^2-8x+12\neq x^2 - 9x + 12\]

  6. Nancy_Lam
    • 3 years ago
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    \[x=\frac{-b^2\pm \sqrt{b^2-4ac}}{2a}\]a=1, b= -9 , c=12

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