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anonymous

  • one year ago

Help, please? Which polynomial is a perfect square trinomial? 49x2 − 28x + 16 4a2 − 20a + 25 25b2 − 20b − 16 16x2 − 24x − 9

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  1. welshfella
    • one year ago
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    find the square root of the first and last terms and try to combine them to get the middle term

  2. welshfella
    • one year ago
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    * first and last coefficients I should have said

  3. welshfella
    • one year ago
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    (a + b^2 = a^2 + 2ab + b^2 a and b have to such that they can form 2ab

  4. anonymous
    • one year ago
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    I want to say B but I'm not sure-

  5. welshfella
    • one year ago
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    the last 2 option are incorrect because there are no real square roots of -16 and -9

  6. welshfella
    • one year ago
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    what are the square roots of 2a^2 and 25

  7. welshfella
    • one year ago
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    * 4a^2 and 25?

  8. welshfella
    • one year ago
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    remember that 25 = 5*5 or -5*-5

  9. anonymous
    • one year ago
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    The square root of 25 is 5, but I'm not sure about 4a^2

  10. welshfella
    • one year ago
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    2a * 2a = 4a^2

  11. welshfella
    • one year ago
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    sqrt 25 is 5 OR -5

  12. anonymous
    • one year ago
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    Okay, that makes sense, so wait would the square root of 4a^2 be 2a?

  13. welshfella
    • one year ago
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    so if a = 2a and b = -5 what is the value of 2ab?

  14. welshfella
    • one year ago
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    yes

  15. anonymous
    • one year ago
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    So it would be 2a*5 since b=5?

  16. anonymous
    • one year ago
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    Or -5 I should say.

  17. welshfella
    • one year ago
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    no 2 * 2a * -5

  18. welshfella
    • one year ago
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    what does that come to?

  19. anonymous
    • one year ago
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    2a*25, right? Since you really can't do anything with the A right now because we don't know what that is-

  20. anonymous
    • one year ago
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    NONO NEVERMIND 2a*10

  21. welshfella
    • one year ago
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    2a * -10

  22. welshfella
    • one year ago
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    its NEGATIVE 5 here because the middle term is negative

  23. anonymous
    • one year ago
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    Oh, okay. That makes more sense.

  24. welshfella
    • one year ago
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    so what does 2*-10a simplify to?

  25. anonymous
    • one year ago
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    -20a?

  26. anonymous
    • one year ago
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    I think that's right at least-

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