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anonymous

  • one year ago

Quadratic Formulas - 10 questions tried 6 times and failed epically. just don't get it. 1) When the sum of 5 and twice a positive number is subtracted from the square of the number, 0 results. Find the number. 2) 2/5x^2 -x+ 19/15 =0 3) .6x^2 = 1.2x +0.6 4) A rule for estimating the number of board feet of lumber that can be cut from a log depends on the diameter of the log. To find the diameter required to get 121 board ft of lumber, the equation (d-4/4)^2 = 121. are both answers reasonable? 5) 9x^2 -7x -5=0 6) 5x^2 - 2x +13 = 18x +1 7) 6p^2 = -19p -3 8) 5x^2 = -20x

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  1. anonymous
    • one year ago
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    9) I can do this one :) 10) 5x^2 = 3 +2x

  2. hybrik
    • one year ago
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    Do you know the quadratic formula?

  3. anonymous
    • one year ago
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    ax2 + bx +c = 0

  4. anonymous
    • one year ago
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    x^2

  5. hybrik
    • one year ago
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    You have to put it in that form for the quadratic formula.

  6. anonymous
    • one year ago
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    I did 8&9

  7. anonymous
    • one year ago
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    oh the x = -b (sqrt b-4(a)(c))/ 2(a)

  8. hybrik
    • one year ago
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    Yes, \[x =\frac{ -b \pm \sqrt{b^2-4ac} }{ 2a}\]

  9. hybrik
    • one year ago
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    you have to plug in the points.

  10. hybrik
    • one year ago
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    Try #1.

  11. anonymous
    • one year ago
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    x^2 + 2x+5=0 ?

  12. hybrik
    • one year ago
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    To do this, you can plug in the points to get:

  13. hybrik
    • one year ago
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    wait keep in mind if it is just x^2, the value is 1

  14. hybrik
    • one year ago
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    Okay so you would have \[x=\frac{ -2\pm \sqrt{(2)^2-4(1)(5)} }{ 2(1) }\]

  15. anonymous
    • one year ago
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    I gtg, will be on tomorrow can you help then?

  16. anonymous
    • one year ago
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    no available computer till tomorrow

  17. hybrik
    • one year ago
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    Okay.

  18. anonymous
    • one year ago
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    Thank You so much. Very appreciated

  19. hybrik
    • one year ago
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    Your welcome.

  20. anonymous
    • one year ago
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    um...so did you still want to help me? lol

  21. pooja195
    • one year ago
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    Can you make a post for each question so its easier to help? .-.

  22. anonymous
    • one year ago
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    I mean, yeah I can lol.

  23. pooja195
    • one year ago
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    Thanks :3

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