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Renee99 Group Title

How can you tell when a quadratic equation has no real solutions? A. when the radicand is negative B. when b in the quadratic formula is greater than the radicand C. when the radicand equals zero D. when the radicand is not a perfect square I believe the answer is A? is that right?

  • 2 years ago
  • 2 years ago

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  1. Mertsj Group Title
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    A

    • 2 years ago
  2. campbell_st Group Title
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    its A using the discriminant \[b^2 - 4ac\] < 0 no real solutions the radical will be negative

    • 2 years ago
  3. experimentX Group Title
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    whats radicand anyway??

    • 2 years ago
  4. experimentX Group Title
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    i go with campbell

    • 2 years ago
  5. campbell_st Group Title
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    the square root symbol

    • 2 years ago
  6. Mertsj Group Title
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    b^2-4ac

    • 2 years ago
  7. Mertsj Group Title
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    \[x=\frac{-b \pm \sqrt{b^2-4ac}}{2a}\]

    • 2 years ago
  8. Renee99 Group Title
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    Thanks!! :) I also have this one... For which value of x does the graph of y = 2x2 − 7x + 6 cross the x-axis? A. −3/2 B. −2/3 C. 2 D. 3 I think its C.

    • 2 years ago
  9. Mertsj Group Title
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    \[b^2-4ac\] is the discriminant

    • 2 years ago
  10. Mertsj Group Title
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    You are correct.

    • 2 years ago
  11. campbell_st Group Title
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    you can substitute each value to find y = 0 or factorise (2x - 3)(x - 2) = 0 x = 3/2 and 2

    • 2 years ago
  12. Renee99 Group Title
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    Thanks so much, here's another one i'm stuck on... What are the approximate solutions of 4x2 + 3 = −12x to the nearest hundredth? A. x ≈ −3.23 and x ≈ 0.23 B. x ≈ −2.72 and x ≈ −0.28 C. x ≈ 0.28 and x ≈ 2.72 D. x ≈ −0.23 and x ≈ 3.23 I think its C, but I'm not sure??

    • 2 years ago
  13. campbell_st Group Title
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    put it in standard form 4x^2 + 12x + 3 = 0 use the general quadratic formula \[x = (-b \pm \sqrt{b^2 - 4ac})/2a\] in your question a = 4, b = 12 and c = 3

    • 2 years ago
  14. Mertsj Group Title
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    C is correct.

    • 2 years ago
  15. Renee99 Group Title
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    thanks so much!! :)

    • 2 years ago
  16. Mertsj Group Title
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    No. It's B

    • 2 years ago
  17. Mertsj Group Title
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    Both roots are negative.

    • 2 years ago
  18. Renee99 Group Title
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    B? Really? are you sure?

    • 2 years ago
  19. Renee99 Group Title
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    Okay, i'll trust you! :)

    • 2 years ago
  20. Mertsj Group Title
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    \[x=\frac{-12\pm \sqrt{96}}{8}\]

    • 2 years ago
  21. Renee99 Group Title
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    I have one more question that's really confusing me, would you mind sticking around for one more?

    • 2 years ago
  22. Mertsj Group Title
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    \[x=\frac{-12+9.80}{8} or x=\frac{-12-9.80}{8}\]

    • 2 years ago
  23. Mertsj Group Title
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    ok

    • 2 years ago
  24. Renee99 Group Title
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    *note* don't ask me why the numbers are spreed out like that, I just copied and pasted it onto here, that how it looks on my paper. Which part of the quadratic formula tells you whether the quadratic equation can be solved by factoring? −b b2 − 4ac 2a Use the part of the quadratic formula that you chose above and find its value given the following quadratic equation: 2x2 + 7x + 3 = 0

    • 2 years ago
  25. Mertsj Group Title
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    b^2-4ac

    • 2 years ago
  26. Renee99 Group Title
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    is that the answer?

    • 2 years ago
  27. Mertsj Group Title
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    Well which part would you choose? -b? 2a????

    • 2 years ago
  28. Mertsj Group Title
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    \[b^2-4ac=7^2-4(2)(3)=49-24=25\]

    • 2 years ago
  29. Renee99 Group Title
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    I don't know... This is really confusing me for some reason...

    • 2 years ago
  30. Renee99 Group Title
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    so the answer is b^2-4ac?

    • 2 years ago
  31. Renee99 Group Title
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    I'm still confused... :/

    • 2 years ago
  32. Renee99 Group Title
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    or is the answer this: b² - 4ac = (7)² - 4(2)(3) = 49 - 24 = 25.

    • 2 years ago
  33. Mertsj Group Title
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    The discriminant, which is b^2-4ac, is the part of the quadratic formula which tells you about the roots.

    • 2 years ago
  34. Mertsj Group Title
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    Do you understand that the question has two parts? READ THE QUESTION!!!

    • 2 years ago
  35. Mertsj Group Title
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    PART 1: Which part of the quadratic formula tells you whether the quadratic equation can be solved by factoring?

    • 2 years ago
  36. Mertsj Group Title
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    The answer to that is :b^2-4ac

    • 2 years ago
  37. Mertsj Group Title
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    PART 2: Use the part of the quadratic formula that you chose above and find its value given the following quadratic equation: 2x2 + 7x + 3 = 0

    • 2 years ago
  38. Mertsj Group Title
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    The answer to that is 25

    • 2 years ago
  39. Renee99 Group Title
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    ohhh okay, I understand now

    • 2 years ago
  40. Renee99 Group Title
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    Thank you!!

    • 2 years ago
  41. Mertsj Group Title
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    yw

    • 2 years ago
  42. Renee99 Group Title
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    I just wasn't looking at the problem correctly, sorry for the confusion and thanks again for breaking it down for me

    • 2 years ago
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