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specialistt

  • 3 years ago

19. What is the value of c so that x² – 11x + c is a perfect-square trinomial? 121 –

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  1. specialistt
    • 3 years ago
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    ignore the 121 lol

  2. amistre64
    • 3 years ago
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    well, a perfect square is of the form (a+b)^2, which expands out to: a^2+2ab+b^2 lets compare that to what you are given x^2 –11x + c looks like a=x, and 2bx = -11x id say b = -11/2 so c = b^2

  3. specialistt
    • 3 years ago
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    i have worked it out and i cannot find the right answer.. the choices are, 121 121 over 4 -11 over 4 121 over 2

  4. amistre64
    • 3 years ago
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    .... id say b = -11/2 so c = b^2 what praytell is (-11/2)^2 ?

  5. timo86m
    • 3 years ago
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    is this completing the square?

  6. specialistt
    • 3 years ago
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    -11/4?

  7. amistre64
    • 3 years ago
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    no, -11/4 you got the /4 part right now what is (-11)^2 ?

  8. specialistt
    • 3 years ago
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    121/4.. im pretty sure that it!

  9. amistre64
    • 3 years ago
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    \[\frac{-11}{2}*\frac{-11}{2}=\frac{(-11)^2}{(2)^2}\]

  10. amistre64
    • 3 years ago
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    yes, that would be it :)

  11. specialistt
    • 3 years ago
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    okay thank you soo much! XD

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