anonymous
  • anonymous
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
Mathematics
chestercat
  • chestercat
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klimenkov
  • klimenkov
What do you think about it?
anonymous
  • anonymous
i think its the middle one
klimenkov
  • klimenkov
Why so you think so? Or you just guess?

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anonymous
  • anonymous
well, i think you need that to factor, but its pretty much just a guess
anonymous
  • anonymous
why, what are you thinking?
klimenkov
  • klimenkov
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.
anonymous
  • anonymous
the b^2-4ac > 0 means there are two distinct real roots
anonymous
  • anonymous
|dw:1365103062271:dw|
anonymous
  • anonymous
oh, soo than my guess was wrong? @klimenkov @alexwantstolearn
anonymous
  • anonymous
its is the middle on you are correct that part will tell you how many x intercepts there are
anonymous
  • anonymous
i will provide an example
anonymous
  • anonymous
|dw:1365103320051:dw|
anonymous
  • anonymous
ohh, hah cool! so i am right!
anonymous
  • anonymous
okay, so what about the second part?
anonymous
  • anonymous
|dw:1365103456715:dw|
anonymous
  • anonymous
just about todo that
anonymous
  • anonymous
what?
anonymous
  • anonymous
when you said the second part you want to know how that applies to that equation correct
anonymous
  • anonymous
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
anonymous
  • anonymous
sorry i find it really hard to read when its not an image
anonymous
  • anonymous
|dw:1365103731072:dw|
anonymous
  • anonymous
|dw:1365103799936:dw|
anonymous
  • anonymous
sooo, ahah what is this?
anonymous
  • anonymous
since its positive it means it has real roots
anonymous
  • anonymous
sorry what part don't understand and i will try and explain it more clearly
anonymous
  • anonymous
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
anonymous
  • anonymous
the answer too b is 25
anonymous
  • anonymous
do you understand why that part of the quadratic equation is essential
anonymous
  • anonymous
so the answers summarised are
anonymous
  • anonymous
|dw:1365104088534:dw|
anonymous
  • anonymous
are you happy with the answer i have shown the answer to a and b
anonymous
  • anonymous
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
anonymous
  • anonymous
yes, thank you soo much!!!
anonymous
  • anonymous
@alexwantstolearn

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