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thisisarri

  • 3 years ago

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

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  1. klimenkov
    • 3 years ago
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    What do you think about it?

  2. thisisarri
    • 3 years ago
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    i think its the middle one

  3. klimenkov
    • 3 years ago
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    Why so you think so? Or you just guess?

  4. thisisarri
    • 3 years ago
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    well, i think you need that to factor, but its pretty much just a guess

  5. thisisarri
    • 3 years ago
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    why, what are you thinking?

  6. klimenkov
    • 3 years ago
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    You can factor this only in case if you have real roots. They will be if the discriminant of your equation is bigger that zero.

  7. alexwantstolearn
    • 3 years ago
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    the b^2-4ac > 0 means there are two distinct real roots

  8. alexwantstolearn
    • 3 years ago
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    |dw:1365103062271:dw|

  9. thisisarri
    • 3 years ago
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    oh, soo than my guess was wrong? @klimenkov @alexwantstolearn

  10. alexwantstolearn
    • 3 years ago
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    its is the middle on you are correct that part will tell you how many x intercepts there are

  11. alexwantstolearn
    • 3 years ago
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    i will provide an example

  12. alexwantstolearn
    • 3 years ago
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    |dw:1365103320051:dw|

  13. thisisarri
    • 3 years ago
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    ohh, hah cool! so i am right!

  14. thisisarri
    • 3 years ago
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    okay, so what about the second part?

  15. alexwantstolearn
    • 3 years ago
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    |dw:1365103456715:dw|

  16. alexwantstolearn
    • 3 years ago
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    just about todo that

  17. thisisarri
    • 3 years ago
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    what?

  18. alexwantstolearn
    • 3 years ago
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    when you said the second part you want to know how that applies to that equation correct

  19. thisisarri
    • 3 years ago
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    noo, i mean this: Use the part of the quadratic formula that you chose above and find its value given the following quadratic equation: 2x2 + 7x + 3 = 0

  20. alexwantstolearn
    • 3 years ago
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    sorry i find it really hard to read when its not an image

  21. alexwantstolearn
    • 3 years ago
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    |dw:1365103731072:dw|

  22. alexwantstolearn
    • 3 years ago
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    |dw:1365103799936:dw|

  23. thisisarri
    • 3 years ago
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    sooo, ahah what is this?

  24. alexwantstolearn
    • 3 years ago
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    since its positive it means it has real roots

  25. alexwantstolearn
    • 3 years ago
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    sorry what part don't understand and i will try and explain it more clearly

  26. thisisarri
    • 3 years ago
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    like, there are so many numbers i dont know which one is the answer. so look at the b part that i typed a few minutes ago and tell me what i should put in it

  27. alexwantstolearn
    • 3 years ago
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    the answer too b is 25

  28. alexwantstolearn
    • 3 years ago
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    do you understand why that part of the quadratic equation is essential

  29. alexwantstolearn
    • 3 years ago
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    so the answers summarised are

  30. alexwantstolearn
    • 3 years ago
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    |dw:1365104088534:dw|

  31. alexwantstolearn
    • 3 years ago
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    are you happy with the answer i have shown the answer to a and b

  32. alexwantstolearn
    • 3 years ago
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    also i have explained why b^2-4ac is needed and gave an example of its use. I also calculated b for you and showed you what the value of a, b and c

  33. thisisarri
    • 3 years ago
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    yes, thank you soo much!!!

  34. thisisarri
    • 3 years ago
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    @alexwantstolearn

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