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mmiranda50

  • 2 years ago

What are the approximate solutions of 2x2 − 7x = 3 rounded to the nearest hundredth? No real solutions x ≈ −0.77 and x ≈ 7.77 x ≈ −0.39 and x ≈ 3.89 x ≈ −3.89 and x ≈ 0.39

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  1. ucreategames
    • 2 years ago
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    Im confused by this problem. 2x2 would make people think you're multiplying 2 by 2. What does the equation really look like?

  2. mmiranda50
    • 2 years ago
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    2x^2 - 7x = 3

  3. ucreategames
    • 2 years ago
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    Oh ok

  4. Jack1
    • 2 years ago
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    factor first: (2x-1)(x-3)

  5. Jack1
    • 2 years ago
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    so either 2x-1=0 or x-3 = 0

  6. Jack1
    • 2 years ago
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    so x= 1/2 or x = 3

  7. mmiranda50
    • 2 years ago
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    that is not in the choices though

  8. Jack1
    • 2 years ago
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    yeah... somethings wrong...

  9. Jack1
    • 2 years ago
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    2x^2 - 7x = 3 2x^2 - 7x - 3 = 0 (2x-1)(x-3) ===> this line's wrong

  10. mmiranda50
    • 2 years ago
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    so how do i solve it?

  11. Jack1
    • 2 years ago
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    y = ax^2 + bx + c y = 0 at x points of:

  12. Jack1
    • 2 years ago
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    \[ \frac{ -b +/-\sqrt{(b ^{2}-4ac} }{ 2a }\]

  13. mmiranda50
    • 2 years ago
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    i'm confused

  14. Jack1
    • 2 years ago
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    so: from your equation a = 2 b = -7 c = -3 sub those numbers into the equation I gave you and you'll get answers for x

  15. Jack1
    • 2 years ago
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    \[x = \frac{ 7 - \sqrt{73} }{ 4}\]

  16. Jack1
    • 2 years ago
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    \[or x = \frac{ 7 + \sqrt{73} }{ 4}\]

  17. Jack1
    • 2 years ago
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    so x = 3.886 and x = -0.386

  18. mmiranda50
    • 2 years ago
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    ok thanks for the help

  19. Jack1
    • 2 years ago
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    all good, sorry for the stuff up earlier

  20. mmiranda50
    • 2 years ago
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    thats fine

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