Free GRE Prep Hour: Quadratic Equations

Twice monthly, Manhattan Prep hosts a free, one-hour GRE prep session lead by one of our 99th-percentile GRE instructors.


In this session, GRE instructor Logan Smeallie guides you through GRE content drawing from the 5 lb. Book of GRE Practice Problems.
Occasionally on the GRE you'll have to deal with quadratic equations—that is, equations with an x² term (or a different variable squared). There are a few quadratic-specific techniques to learn, most prominently factoring a quadratic equation to find TWO possible answers for x. Watch on to learn about that factoring process, the "Special Products," and whether or not you really need to memorize the quadratic formula.

00:00 Intro
02:15 Quadratic Equations Overview
17:42 The Quadratic Formula
24:05 Quadratic Sample Problem
30:50 Special Products
39:15 Quadratics and QC

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[faroukabdeen]

Thanks a lot,
It's a very simple way for explanation

[muhammadaamir]

For QC1 45:45, D is the correct answer, since the question does not tell us the property of variable Z. If Z is not a real number but an imaginary number ( i² = −1.), then the answer would be incorrect. if z=3i, then the answer would be -9.

[Iszzytone]

I have a question the last QC that u clear out 12a² I think quantity B should be greater because there's a condition saying a>0 given us an option to input any greater than zero value in both QA and QB, and if I add any same number at all thats > 0 QB is always greater. This should logically tell us QB is greater? Please ill need a response sir thanks ❤❤

[AbdouTVstronge]

If Delta=0, there is one solution and its sign is from the sign of a.
Why did say that it is negative

[Ultrak-rsmn]

i canot understand your last quantity product