Solving Cubic Equations (factoring)

[matthewkennard]

Why is it that every tutorial on youtube is extremely easy to factor out but every problem in my Algebra 2 class requires hours of work for one problem?

[ielizabethm]

I needed some recap for my first year of University and I like the way you explain. You explain in such a straightforward and clear manner. Thanks for this little example!

[rabeazeynali]

I don't trust someone who writes an x like that

[joonchild.]

I've been trying to understand this concept all semester & I finally get it. Thanks!

[WreathStorm]

As a college student, I COMPLETELY forgot about this technique, which is useful for partial fraction decomposition. Thank you so much for the video! ^^

[ankitbarman]

this equation is so easy to solve. anyone can do it. post a tutorial solving tougher equations.

[jawnvawn]

Guys come on. Easy problems make the best examples and this was well done. If this video doesn't satisfy you watch a few more vids.

[jacobhougham]

My pre-calculus teacher skipped over this portion and left me confused, this helped a lot.

[poojav]

Haha she took an easy equation and solved it :P Gal u wasted my time so I'm here to comment n waste few more seconds of mine .

[mohammadhammoudeh]

Three step magic! Really helpful for Partial Fraction integration. Thanks!

[gumpert]

But if the coefficients of cubic equation cannot divide so easy, such this example, what will you do in this case?

[mistervoldemort]

Yes but in this case you can easily factorize from the beginning (with x-4), but I don't think that would occur most of the time.

[DylanOwnzNoobz]

This is cool and an eye opener.

But what if I have something like

2x^3 + 7x^2 + 7x + 12

There are no common factors I can factorise between 7x and 12.

[efoloria]

ME:reading the comments from 5, 3, 4 years ago...

I'm in the future


Btw tqvm for this..it help me alot

[Fantasticifaction]

f(x) = x^3 - 11x^2 - 25x - 13
y = p*x + q
Line Y is the tangent of f(x) at A(a, f(a)) and intersects with f(x) at B (13, 0). A =/= B. What is the sum of p+q?

This requires solving a cubic that is not as convenient. Maybe a fun assignment for some out there. The solution is p=q=0 (a = -1 or a = -13). There are at least two other ways to solve it (a lot quicker than factoring a cubic equation) but none that I can comprehend haha

[gracekelly]

I just watched so many videos on cubic equations and this was the only one i found helpful thank you!

[crasscookie]

Completely ineffective for my problem :'0

[dannylopez]

dude this helped so much. I got stuck watching a how to solve cubic equations video for like an hour and i literally just took like 2 minutes with this!

[ReflejandodeAmorDios]

This is just what I needed! Reviewing some basic algebra principles in order to prep for my Calc class. Thank you!

[EM-qwbj]

All of this hate about the problems being too easy is just a waste of time. The video was probably made to show people the basic strategy to solve a cubic equation. It wasn't meant to be super confusing by using complex problems.