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happykiddo

  • one year ago

Could someone please tell me what are two numbers that multiply to -140 and add together to 4?

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  1. precal
    • one year ago
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    |dw:1364524020116:dw|are you sure it is not subtract to make 140

  2. precal
    • one year ago
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    |dw:1364524067794:dw|is it like this?

  3. happykiddo
    • one year ago
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    yes its x^2+4x-140

  4. tomhoffhim
    • one year ago
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    the numbers have to be really close to one another

  5. precal
    • one year ago
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    always list your factors don't worry about the signs

  6. precal
    • one year ago
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    |dw:1364524588051:dw|x times x gives you x^2

  7. tomhoffhim
    • one year ago
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    14 and -10

  8. kelliegirl33
    • one year ago
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    (x - 10)(x + 14) a + b = 4 14 - 10 = 4 a x b = -140 (14)(-10) = - 140 14 and - 10

  9. precal
    • one year ago
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    |dw:1364524606341:dw|

  10. precal
    • one year ago
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    the sign in front of 140 is negative and that tells you to subtract your factors

  11. precal
    • one year ago
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    |dw:1364524645117:dw|

  12. happykiddo
    • one year ago
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    geez its -10 and 14 How did i miss that. Thanks to all that helped

  13. precal
    • one year ago
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    |dw:1364524677588:dw|

  14. precal
    • one year ago
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    to have a negative your sign choices are (-)(+) +14-10 or -14+10

  15. precal
    • one year ago
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    we need +4 so we must use +14-10=+4

  16. precal
    • one year ago
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    |dw:1364524736862:dw|signs give us the middle term

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