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anonymous

  • one year ago

(2x – 1)(x + 7) = 0 Did i do this right guessing I distribute 2x*x = 2x^2 + 2x*7=14. -1* x = x -1*7 = -7 2x^2 +14+ x -7 2x^2 +x = 2x^3 14 -7= 7 2x^3+ 7

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  1. pooja195
    • one year ago
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    Are we solving for x?

  2. anonymous
    • one year ago
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    Solve each quadratic equation. Show your work. that's what it says.

  3. pooja195
    • one year ago
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    so they want the value of x?

  4. pooja195
    • one year ago
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    (2x – 1)(x + 7) = 0 We would use the 0 product property right? @jim_thompson5910 :/ am i right?

  5. anonymous
    • one year ago
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    Huh?

  6. jim_thompson5910
    • one year ago
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    |dw:1437707414800:dw|

  7. jim_thompson5910
    • one year ago
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    |dw:1437707424790:dw|

  8. jim_thompson5910
    • one year ago
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    solve each equation for x

  9. pooja195
    • one year ago
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    i was right :)

  10. pooja195
    • one year ago
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    @Ashtaroth You are doing more work than needed

  11. anonymous
    • one year ago
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    More work then needed? What do you mean?

  12. pooja195
    • one year ago
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    You dont need to do all that work just do what @jim_thompson5910 drew

  13. anonymous
    • one year ago
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    Oh. Kool then.

  14. anonymous
    • one year ago
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    So after that i'm finish?

  15. pooja195
    • one year ago
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    yes u will have 2 solution's

  16. UsukiDoll
    • one year ago
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    after you solve those equations .. yes.. there should be x = (two numbers)

  17. pooja195
    • one year ago
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    x=? x=?

  18. UsukiDoll
    • one year ago
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    |dw:1437707649100:dw|

  19. anonymous
    • one year ago
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    2x-1 and x+7=0

  20. anonymous
    • one year ago
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    Guess i was wrong then :P

  21. anonymous
    • one year ago
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    I think i got it though. Thank you all for you'r help :)

  22. pooja195
    • one year ago
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    :)

  23. UsukiDoll
    • one year ago
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    you were distributing... not solving for x . the problem is already factored

  24. anonymous
    • one year ago
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    So.. My answer was right or wrong?

  25. UsukiDoll
    • one year ago
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    your attempt was way off

  26. pooja195
    • one year ago
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    Wrong you didnt even solve for x

  27. anonymous
    • one year ago
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    Heh.. So i was wrong?

  28. pooja195
    • one year ago
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    yes

  29. anonymous
    • one year ago
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    Okay. so i'm suppose to solve the quadratic equation. then show my work.

  30. pooja195
    • one year ago
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    |dw:1437708079679:dw|

  31. pooja195
    • one year ago
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    ^solve for x .-.

  32. jim_thompson5910
    • one year ago
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    focus on just 2x-1 = 0 what number can we replace x with to make the equation true?

  33. anonymous
    • one year ago
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    -2?

  34. LynFran
    • one year ago
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    you were suppose to work the problem to solve for x... here is an example|dw:1437715265345:dw|

  35. jim_thompson5910
    • one year ago
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    2x-1 = 0 2*(-2)-1 = 0 ... replace x with -2 -4 - 1 = 0 -5 = 0 ... this is a false equation so x = -2 isn't the answer

  36. anonymous
    • one year ago
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    Alright.

  37. jim_thompson5910
    • one year ago
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    look at what LynFran posted

  38. UsukiDoll
    • one year ago
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    so we need to find that x that makes the statement true.. @LynFran provided a good example :)

  39. anonymous
    • one year ago
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    So we divide?

  40. UsukiDoll
    • one year ago
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    consider 2x-1 = 0 we need to solve for x. ... do we add, subtract, multiply , or divide?

  41. anonymous
    • one year ago
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    Add?

  42. UsukiDoll
    • one year ago
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    yeah. add what number to both sides?

  43. anonymous
    • one year ago
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    2x+1 and -1+1? 3x =0?

  44. anonymous
    • one year ago
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    Wifi is bad

  45. UsukiDoll
    • one year ago
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    umm we can't combine 2x +1 however we do add 1 to both sides 2x-1=0 2x=1 now how do we get x by itself

  46. anonymous
    • one year ago
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    Hmm. subtract -2 from both sides?

  47. UsukiDoll
    • one year ago
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    no.

  48. UsukiDoll
    • one year ago
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    hint: use division

  49. anonymous
    • one year ago
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    divide by 2x/2 1/2?

  50. UsukiDoll
    • one year ago
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    yeah 2x=1 divide 2 from both sides 2x=1 --- --- 2 2 x = 1/2

  51. UsukiDoll
    • one year ago
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    now for x+7=0 how do we get x by itself?

  52. anonymous
    • one year ago
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    add the x with the 7 then divide by 7?

  53. UsukiDoll
    • one year ago
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    we don't have to do division... for x+7=0 because there is no number attached to the variable on the previous problem we had to divide because we want x by itself we just have x+7=0

  54. UsukiDoll
    • one year ago
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    what's the opposite of addition?

  55. anonymous
    • one year ago
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    subtraction.

  56. UsukiDoll
    • one year ago
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    yes. just subtract 7 from both sides

  57. anonymous
    • one year ago
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    7/7 7/0 =7

  58. UsukiDoll
    • one year ago
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    whoa we can't have 7/0 that's undefinded

  59. anonymous
    • one year ago
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    Okay.

  60. UsukiDoll
    • one year ago
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    x+ 7 = 0 -7 -7 x+7-7 =0-7 what is 7-7 what's 0-7

  61. anonymous
    • one year ago
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    -7?

  62. UsukiDoll
    • one year ago
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    woohoo!

  63. UsukiDoll
    • one year ago
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    so our two solutions are x= -7 and x =1/2

  64. anonymous
    • one year ago
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    Alright do we plug them in or our we finish?

  65. UsukiDoll
    • one year ago
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    we're done

  66. anonymous
    • one year ago
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    Thanks XD I am tired. Good night

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