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anonymous

  • one year ago

how do i do quadratics equations?? i get totally loss when im doing this

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  1. anonymous
    • one year ago
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    What about quadratic equations?

  2. MeowLover17
    • one year ago
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    Okay so first off lets identify quadratics

  3. MeowLover17
    • one year ago
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    x^2-x+1=0 is a quadratic

  4. MeowLover17
    • one year ago
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    How do you know this you may ask? Well first off the X's exponent cuts in half

  5. MeowLover17
    • one year ago
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    Now to solve for a quadratic there are two ways that are most commonly used

  6. MeowLover17
    • one year ago
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    First there is the Quadratic Formula that you may or may not know, which is

  7. anonymous
    • one year ago
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    o.O im confused once more

  8. MeowLover17
    • one year ago
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    \[b \pm \sqrt{b^2-4ac//2}\]

  9. MeowLover17
    • one year ago
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    We could solve a quadratic if you have one available and i'll walk you through the steps.

  10. MeowLover17
    • one year ago
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    Would you like to solve a simple quadratic with me?

  11. anonymous
    • one year ago
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    ok?

  12. MeowLover17
    • one year ago
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    \[8x^2+16x-20=0\]

  13. MeowLover17
    • one year ago
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    Do you know how to solve this?

  14. Nnesha
    • one year ago
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    there is a typo you forgot - and a at the denominator \[\huge\rm \frac{ \color{red}{- }b \pm \sqrt{b^2 -4ac} }{ 2\color{reD}{a} }\] quadratic formula where abc values are \[\huge\rm Ax^2 +Bx+C=0\]

  15. MeowLover17
    • one year ago
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    @Nnesha Sorry thank you for catching that :D

  16. Nnesha
    • one year ago
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    np :-)

  17. MeowLover17
    • one year ago
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    Ok onlii_bri lets try to solve to quadratic above, would you like to use the quadratic formula or split it up?

  18. anonymous
    • one year ago
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    |dw:1433635733307:dw|

  19. MeowLover17
    • one year ago
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    Whats that o-o

  20. anonymous
    • one year ago
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    dats how my teacher taught how to do it

  21. MeowLover17
    • one year ago
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    Lets do a different way for now,

  22. MeowLover17
    • one year ago
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    I'll work out the entire problem then i want you to try okay?

  23. anonymous
    • one year ago
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    ummm i have ncse in my country and my maths test is monday i need to learn it that way

  24. anonymous
    • one year ago
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    ok

  25. MeowLover17
    • one year ago
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    Idk how to do it that way sorry :( i only know how i learnt it from my algebra 2 and algebra 1 teachers.

  26. MeowLover17
    • one year ago
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    Maybe you are getting lost because your using a very traditional way of doing it

  27. anonymous
    • one year ago
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    im still on basic algebra

  28. MeowLover17
    • one year ago
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    Oh okay, thats alright let me give you a little lesson on quadratics and it will make it a whole lot easier to understand, ask me any questions as i go.

  29. MeowLover17
    • one year ago
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    \[Ax^2+Bx+C=0\]

  30. MeowLover17
    • one year ago
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    That is how you identify a quadratic

  31. MeowLover17
    • one year ago
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    Now they can also look like this 3x^2+9x+10=0

  32. MeowLover17
    • one year ago
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    Quadratics must always be equal to zero in order to be a quadratic.

  33. MeowLover17
    • one year ago
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    \[3x^2+9x+10=0\]

  34. MeowLover17
    • one year ago
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    Lets solve for the quadratic above very quickly.

  35. MeowLover17
    • one year ago
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    |dw:1433636159214:dw|

  36. MeowLover17
    • one year ago
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    First step is to multiply what is Squared by the constant. in this case we have 3

  37. MeowLover17
    • one year ago
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    3*10 = 30

  38. MeowLover17
    • one year ago
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    Now you must break down the multiples of 30 to see if any of them add up to 9.

  39. MeowLover17
    • one year ago
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    Well scratch that there are no multiplies of 30 that can add up or subtract to equal 9, so in this case we will use the quadratic formula.

  40. MeowLover17
    • one year ago
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    |dw:1433636365799:dw|

  41. MeowLover17
    • one year ago
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    |dw:1433636435572:dw|

  42. MeowLover17
    • one year ago
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    So far so good?

  43. MeowLover17
    • one year ago
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    Now you just plug in those numbers into the equation then plug into your calculator.

  44. MeowLover17
    • one year ago
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    If you need anymore help just ask, were all here to help.

  45. MeowLover17
    • one year ago
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    Also just so you know the -B is the lower case b in the equation above i just capitalized it by accident.

  46. MeowLover17
    • one year ago
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    https://www.youtube.com/watch?v=3ayhvAI3IeY use this to help you.

  47. anonymous
    • one year ago
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    ok

  48. anonymous
    • one year ago
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    thanx

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