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jazzyfa30

  • 2 years ago

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

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  1. hartnn
    • 2 years ago
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    do you know how to complete the square ?

  2. jazzyfa30
    • 2 years ago
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    no

  3. hartnn
    • 2 years ago
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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 ?

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

  5. hartnn
    • 2 years ago
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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 ?

  6. jazzyfa30
    • 2 years ago
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    u added 4????

  7. hartnn
    • 2 years ago
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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 ?

  8. jazzyfa30
    • 2 years ago
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    yes

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

  10. jazzyfa30
    • 2 years ago
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    2

  11. hartnn
    • 2 years ago
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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 ?

  12. jazzyfa30
    • 2 years ago
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    x+1.4=5

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

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

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

  16. jazzyfa30
    • 2 years ago
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    x=3 anx =-7

  17. hartnn
    • 2 years ago
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    correct! good work :)

  18. JAYLINB
    • 2 years ago
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    JAZZY ITS BRONX

  19. jazzyfa30
    • 2 years ago
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    hi what happenedy u not on ur regulrs account

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

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

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

  23. GoldPhenoix
    • 2 years ago
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    I don't think you can factor that.

  24. jazzyfa30
    • 2 years ago
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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

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

  26. jazzyfa30
    • 2 years ago
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    6 and -3

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

  28. jazzyfa30
    • 2 years ago
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    it is morning hear its 8:30 am

  29. hartnn
    • 2 years ago
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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 ?

  30. jazzyfa30
    • 2 years ago
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    (x+6)-(x-3) i think

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

  32. jazzyfa30
    • 2 years ago
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    oh yeah im sorry yall

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

  34. jazzyfa30
    • 2 years ago
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    -6 andd 3

  35. hartnn
    • 2 years ago
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    \(\large \checkmark \)

  36. jazzyfa30
    • 2 years ago
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    thank you 5 more and im going to sleep

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

  38. jazzyfa30
    • 2 years ago
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    i did

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