SAT Khan Academy Solving Quadratic Equations Level 3

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Watch me solve 5 "Quadratic Equations Problems" level 3 from Khan Academy. I will teach you how to effectively break down the sometimes tricky mechanics involving factoring and solving quadratics. This is a massively important section on the SAT, so take notes and listen up!

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Комментарии
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'never seen anything this hard on the actual SAT' is probably the most reassuring thing to hear :)

ayanali
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Imagine him being your actual math teacher. I'LL NEVER MISS A CLASS.

megan.r
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Hey, thanks for this. Just one note, at the problem at 3:46 you can use the payback method. Just multiply the first coefficient by the constant, making it b^2+2b-6, now factor to 3 and -2, making it (x+3)(x-2), then payback the 2 that u multiply from the start, yielding the factors of (2x+3) and (2x-2) which is really (x-1). Yep.

danielneustadter
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Hi, amazing video, but I just have one question. So basically for the first questions, I noticed that you took almost 3-4 minutes to solve them. If it takes you that long, then it probrblly gonna take us a but longer, so on the actual SAT, what do you suggest we do when we come across a question like this one?

aadhavjaimurugesh
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For question 3, is it possible for you to explain how to find the answer using another formula? I am unfamiliar with the cross thingie that you did.

chantelletyche
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I have a question, what would you say most of the sat question are like, are they level 2 or level 3 or level 4?

midnight
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For question 1, c/a is the way to go (to find the product of roots)

bruhrnav
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at 6:03 you said "divide everything by 2, " why does the sqrt 7 not get divided by 2 then?
Sorry, I don't understand

zxroh
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How do you guys think you did on December SAT?

danielneustadter