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KE8717504

  • 2 years ago

Find all positive and negative integers b such that 7x^2+bx+5 factors. B= (use comma's to seperate answers)

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  1. KE8717504
    • 2 years ago
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    @Shi

  2. Shi
    • 2 years ago
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    I think you should start by using the quadratic formula, though I think there might be a better way

  3. KE8717504
    • 2 years ago
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    what's the better way?

  4. ArkGoLucky
    • 2 years ago
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    take the factors of 7 and 5 and mess with them to get all the possible b's

  5. KE8717504
    • 2 years ago
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    the only factors of 7 are 1 and 7 and the only factors of 5 are 1 and 5

  6. KE8717504
    • 2 years ago
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    so how would i list that?

  7. KE8717504
    • 2 years ago
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    ?

  8. ArkGoLucky
    • 2 years ago
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    the answers are 12, -12, -2 and 2 I think. check if that's right

  9. KE8717504
    • 2 years ago
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    12, -12, 36, -36

  10. ArkGoLucky
    • 2 years ago
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    36 doesn't work try factoring it

  11. Shi
    • 2 years ago
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    7x^2 + 35x + x + 5 7x(x+5) + 1(x+5) (7x+1)(x+5)

  12. Shi
    • 2 years ago
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    I don't think I've had this problem before but http://www.algebra.com/algebra/homework/Polynomials-and-rational-expressions/Polynomials-and-rational-expressions.faq.question.177236.html shows you how to get your solution

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