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

- anonymous

- chestercat

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- klimenkov

What do you think about it?

- anonymous

i think its the middle one

- klimenkov

Why so you think so? Or you just guess?

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## More answers

- anonymous

well, i think you need that to factor, but its pretty much just a guess

- anonymous

why, what are you thinking?

- 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

the b^2-4ac > 0 means there are two distinct real roots

- anonymous

|dw:1365103062271:dw|

- anonymous

oh, soo than my guess was wrong? @klimenkov @alexwantstolearn

- anonymous

its is the middle on you are correct
that part will tell you how many x intercepts there are

- anonymous

i will provide an example

- anonymous

|dw:1365103320051:dw|

- anonymous

ohh, hah cool! so i am right!

- anonymous

okay, so what about the second part?

- anonymous

|dw:1365103456715:dw|

- anonymous

just about todo that

- anonymous

what?

- anonymous

when you said the second part
you want to know how that applies to that equation correct

- 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

sorry i find it really hard to read when its not an image

- anonymous

|dw:1365103731072:dw|

- anonymous

|dw:1365103799936:dw|

- anonymous

sooo, ahah what is this?

- anonymous

since its positive it means it has real roots

- anonymous

sorry what part don't understand and i will try and explain it more clearly

- 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

the answer too b is 25

- anonymous

do you understand why that part of the quadratic equation is essential

- anonymous

so the answers summarised are

- anonymous

|dw:1365104088534:dw|

- anonymous

are you happy with the answer i have shown the answer to a and b

- 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

yes, thank you soo much!!!

- anonymous

@alexwantstolearn

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