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jazzyfa30

Solve the equation by using the Square Root Property. x^2 = 21 - 4x

  • 9 months ago
  • 9 months ago

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  1. hartnn
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    do you know how to complete the square ?

    • 9 months ago
  2. jazzyfa30
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    no

    • 9 months ago
  3. hartnn
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    x^2+4x = 21 here, the co-efficient of 'x' is 4 so, divide it by 2, and take its square, what u get ?

    • 9 months ago
  4. jazzyfa30
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    4/2=2 square root is 1.4

    • 9 months ago
  5. hartnn
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    we need to SQUARE the result so, 2^2 = 4 now, we add this on both sides., x^2+4x+4 = 21+4 = 25 got this ?? notice something about left side ?

    • 9 months ago
  6. jazzyfa30
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    u added 4????

    • 9 months ago
  7. hartnn
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    yes, i added the result (here, we got 4) to both sides now notice that left side is a perfect square! isn't it ?

    • 9 months ago
  8. jazzyfa30
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    yes

    • 9 months ago
  9. hartnn
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    x^2+4x+4 is square of what ?

    • 9 months ago
  10. jazzyfa30
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    2

    • 9 months ago
  11. hartnn
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    4 is the square of 2 x^2+4x+4 will be square of \(\large (x+2) \\ (x+2)^2 =x^2+4x+4\) so we have \((x+2)^2=25\) take square root of both sides , what u get ?

    • 9 months ago
  12. jazzyfa30
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    x+1.4=5

    • 9 months ago
  13. jazzyfa30
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    x+2=5 my b

    • 9 months ago
  14. hartnn
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    yes.. just put +/- in front of 5 x+2=5 or x+2=-5

    • 9 months ago
  15. hartnn
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    can you solve those 2 easy equations ? x+2= 5....x =.. ? x+2=-5, ....x=....?

    • 9 months ago
  16. jazzyfa30
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    x=3 anx =-7

    • 9 months ago
  17. hartnn
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    correct! good work :)

    • 9 months ago
  18. JAYLINB
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    JAZZY ITS BRONX

    • 9 months ago
  19. jazzyfa30
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    hi what happenedy u not on ur regulrs account

    • 9 months ago
  20. jazzyfa30
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    Solve the equation by factoring: x2 = 18 - 3x

    • 9 months ago
  21. GoldPhenoix
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    Does x2 = x^2 And does the = sign suppose to be a + sign?

    • 9 months ago
  22. jazzyfa30
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    sorry im still waking up x^2=18-3x

    • 9 months ago
  23. GoldPhenoix
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    I don't think you can factor that.

    • 9 months ago
  24. jazzyfa30
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    sorry @hartnn i fell asleep i was up all night literally i didnt geta ounce of sleep until after w finished the problem we just finished

    • 9 months ago
  25. hartnn
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    \(x^2+3x-18=0\) can you tell me 2 numbers with sum = 3 and product = -18 ?

    • 9 months ago
  26. jazzyfa30
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    6 and -3

    • 9 months ago
  27. hartnn
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    get some rest then! you can continue in the morning ? yes! 6 and -3 are correct :)

    • 9 months ago
  28. jazzyfa30
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    it is morning hear its 8:30 am

    • 9 months ago
  29. hartnn
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    so, split up, 3x = 6x-3x \(x^2+6x-3x-18=0\) factor out x from 1st 2 terms and -3 from last 2.....can you ?

    • 9 months ago
  30. jazzyfa30
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    (x+6)-(x-3) i think

    • 9 months ago
  31. hartnn
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    there's no - *minus* sign \((x+6)(x-3)=0\) is correct final answer! good :)

    • 9 months ago
  32. jazzyfa30
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    oh yeah im sorry yall

    • 9 months ago
  33. hartnn
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    and since you need to solve find x from x+6=0 and x-3=0

    • 9 months ago
  34. jazzyfa30
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    -6 andd 3

    • 9 months ago
  35. hartnn
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    \(\large \checkmark \)

    • 9 months ago
  36. jazzyfa30
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    thank you 5 more and im going to sleep

    • 9 months ago
  37. hartnn
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    ok! how about asking new question in new post? :)

    • 9 months ago
  38. jazzyfa30
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    i did

    • 9 months ago
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