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tmts98

  • 3 years ago

I need some help with factoring quadratics.

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  1. syhna
    • 3 years ago
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    use the quadratic formula

  2. tmts98
    • 3 years ago
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    I was looking over my notes for my midterm in Algebra II, and I think I copied down this wrong. It says if my original equation is -x²+14x+40 my factored equation would be -1(x+10)(x+4), I foiled this out because it looked wrong and I got positive x²+14+40. What do I have wrong?

  3. tmts98
    • 3 years ago
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    *this down by the way...

  4. syhna
    • 3 years ago
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    -(x^2 - 14 - 40) now factor x^2 - 14 - 40 using either the quadratic formula of completing the square

  5. tmts98
    • 3 years ago
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    Well, I used the quadratic formula and I got: \[x=7\pm3\sqrt{2}\] Is this right?

  6. funinabox
    • 3 years ago
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    to check if your answer is correct, plug the number(s) back into your original expression. if the answer you get is 0, then you have found the correct roots

  7. funinabox
    • 3 years ago
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    because the whole point of factoring is to find what x values make f(x) = 0

  8. tmts98
    • 3 years ago
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    Well, now I am just more confused then when I started,.

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