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Solmyr Group Title

What are the solutions of x2 + 5x − 24 = 0? Show all work for full credit.

  • one year ago
  • one year ago

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  1. muhammad9t5 Group Title
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    do it by factorizing...

    • one year ago
  2. hartnn Group Title
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    hint : split the middle term as 8x-3x

    • one year ago
  3. muhammad9t5 Group Title
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    break 5x in two terms.

    • one year ago
  4. muhammad9t5 Group Title
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    8x-3x

    • one year ago
  5. Solmyr Group Title
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    would it be −b±/b^2 - 4ac ------------- 2a

    • one year ago
  6. hartnn Group Title
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    thats using Quadratic formula...are u asked to use that ? if not factorizing will be better approach

    • one year ago
  7. Solmyr Group Title
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    ya its asking for quadratic formula

    • one year ago
  8. hartnn Group Title
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    Compare your quadratic equation with \(ax^2+bx+c=0\) find a,b,c then the two roots of x are: \(\huge{x=\frac{-b \pm \sqrt{b^2-4ac}}{2a}}\)

    • one year ago
  9. hartnn Group Title
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    so, first tell me what u get for a,b,c.

    • one year ago
  10. Solmyr Group Title
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    a=x^2 b=5 c=24

    • one year ago
  11. hartnn Group Title
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    no, 'a' is the co-efficient of x^2 here u have 1x^2 so a=.... ?

    • one year ago
  12. Solmyr Group Title
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    1^2

    • one year ago
  13. hartnn Group Title
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    |dw:1356626845466:dw|

    • one year ago
  14. Solmyr Group Title
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    a=1 b=5 c=24

    • one year ago
  15. hartnn Group Title
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    are u sure about the value of 'c' ?

    • one year ago
  16. Solmyr Group Title
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    -24

    • one year ago
  17. hartnn Group Title
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    correct, now just plug in the values of a,b,c in that quadratic formula

    • one year ago
  18. Solmyr Group Title
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    −b±/b^2 - 4ac ------------- 2a -5 +/5^2 - 4 * 1 * 24 ------------------ 2 -5 +/ 25 - 96 ----------- 2

    • one year ago
  19. Solmyr Group Title
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    -5 -/5^2 - 4 * 1 * 24 ------------------ 2 -5 -/ 25 - 96 ----------- 2

    • one year ago
  20. hartnn Group Title
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    remember that c=-24 so \(b^2-4ac = 25-4(1)(-24) = 25+96=...?\)

    • one year ago
  21. Solmyr Group Title
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    i cant believe i keep messing that up

    • one year ago
  22. hartnn Group Title
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    everything else was correct.

    • one year ago
  23. Solmyr Group Title
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    121

    • one year ago
  24. hartnn Group Title
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    yes, and \(\sqrt{121}=..?\)

    • one year ago
  25. Solmyr Group Title
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    11 SR

    • one year ago
  26. Solmyr Group Title
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    -5 + 11= 6 -- = 3 2

    • one year ago
  27. hartnn Group Title
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    yes, and (-5-11)/2 =... ?

    • one year ago
  28. hartnn Group Title
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    ?

    • one year ago
  29. Solmyr Group Title
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    -8

    • one year ago
  30. hartnn Group Title
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    thats correct, so 2 roots are 3 and -8.

    • one year ago
  31. Solmyr Group Title
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    ok thank u for all ur help

    • one year ago
  32. hartnn Group Title
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    welcome ^_^

    • one year ago
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