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Brooke2013

  • 3 years ago

Determine which binomial is a factor of -2x^3 + 14x^2 - 24x + 20 A.) x + 5 B.) x + 20 C.) x - 24 D.) x - 5

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  1. irkiz
    • 3 years ago
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    its mcq so its easy to solve X is definitely wrong coz X is not the same as x

  2. irkiz
    • 3 years ago
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    if (x+5) is a factor, then x = -5 would make the equation 0

  3. irkiz
    • 3 years ago
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    if (x-5) is a factor, then x= 5 makes the equation 0

  4. irkiz
    • 3 years ago
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    substitute x = 5 and x = -5 see which one makes it 0

  5. Brooke2013
    • 3 years ago
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    Neither of them do.

  6. irkiz
    • 3 years ago
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    check again

  7. Brooke2013
    • 3 years ago
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    There all 4 little x's I just didn't mean to make the two middle one's capital x's.

  8. Brooke2013
    • 3 years ago
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    So I'll try the other two to see which one is right

  9. irkiz
    • 3 years ago
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    i managed to find the answer by substituting a value

  10. irkiz
    • 3 years ago
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    try x = 5 again

  11. Brooke2013
    • 3 years ago
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    ok, I will

  12. Brooke2013
    • 3 years ago
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    When I put the equation like this -2(5)^3 + 14(5)^2 - 24(5) + 20 I get 100 + 1900 - 120 + 20 and when you add it up it equals 4900

  13. Brooke2013
    • 3 years ago
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    Is the answer x = 5 ?

  14. hartnn
    • 3 years ago
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    yes, x=5 is the root , so x-5 is the factor.

  15. Brooke2013
    • 3 years ago
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    So the answer is D ? x - 5

  16. hartnn
    • 3 years ago
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    yup.

  17. Brooke2013
    • 3 years ago
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    I wish I understood how you got that bc I tried to plugg 5 into where the x's are and I got the answer 4900 not 0

  18. hartnn
    • 3 years ago
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    5^3 = 125 125*2 = 250

  19. hartnn
    • 3 years ago
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    5^2 = 25 25*14=350

  20. hartnn
    • 3 years ago
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    24*5=120

  21. Brooke2013
    • 3 years ago
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    Ok, thanks :)

  22. hartnn
    • 3 years ago
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    got it ?

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