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