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creighton

Parabola question Please help

  • one year ago
  • one year ago

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  1. MilaCoolNess
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    whats the question

    • one year ago
  2. creighton
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    what is the discriminate of this equation: y=-4(x-3)^2+8

    • one year ago
  3. creighton
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    hears the graph

    • one year ago
  4. zainulafaq
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    the discriminant is 2128 do you want me to explain it as well?

    • one year ago
  5. Avva
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    you can simply calculate the discriminate \[b^{2} - 4ac\] by putting the equation in the form \[y=ax^{2} + bx +c\]

    • one year ago
  6. creighton
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    Please explain Sorry had bad internet

    • one year ago
  7. Avva
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    @zainulafaq is it 2128 or 128 ?

    • one year ago
  8. creighton
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    does the B and C stand as coordinates

    • one year ago
  9. zainulafaq
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    firstly expand the equation to standard for i.e \[a x^{2} +bx +c\] which in this case is \[-4x^2 +24x -28\]

    • one year ago
  10. zainulafaq
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    a, b, c are coefficients of \[x^2 , x \] and constant respectively in the expanded form . .

    • one year ago
  11. Avva
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    no they are not coordinates it tells u the nature of the roots whether they are real or imaginary

    • one year ago
  12. creighton
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    k I got it so far Do we solve for x?

    • one year ago
  13. zainulafaq
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    then use the formula for discriminant as @Avva has suggested to find value of discriminant a=-4, b-24, c= -28

    • one year ago
  14. creighton
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    ??

    • one year ago
  15. zainulafaq
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    No if the question asks for discriminant you just have to tell the numerical value of \[[b^2 - 4ac] \]

    • one year ago
  16. creighton
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    k so if we plug in the numbers -24^2-4(-4)(-28)

    • one year ago
  17. creighton
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    right?

    • one year ago
  18. zainulafaq
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    exactly thats perfect

    • one year ago
  19. creighton
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    and we simplify to get our answer right

    • one year ago
  20. creighton
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    @zainulafaq so is it 130 and my work is shown below @zainulafq -24^2-4(-4)(-28) 576+16(-28) 576-448=130

    • one year ago
  21. zainulafaq
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    all of it is excellent except for last step . . 576-448 = 128 not 130 . . .

    • one year ago
  22. creighton
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    whoops so 128 is my answer

    • one year ago
  23. zainulafaq
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    yup now its fine :)

    • one year ago
  24. creighton
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    thanks

    • one year ago
  25. zainulafaq
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    welcome :)

    • one year ago
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