Completing the Square to Solve Quadratic Equations: More Examples - 6

[patrickjmt]

@TheLamborghini9999 happy to help, brother

[KLRB]

Ooooh, i get it now! Divide everything by the a in ax^2 to make the ax^2 = 1x^2 and you can solve for bx by simply halving it. Helps me heaps for my exam, thanks chief!

[Quichey]

You should do an example about when to factor, complete the square, or use the quadratic formula.

[patrickjmt]

@seb43654 glad i could help you out : )

[soccer]

I just wanted to say thank you I'm in college and this still helps. Great job and thanks again.

[acdp]

@TheDuskMar you use factoring when the equation is factorable, you use completing the square if it's not. you can use quadratic formula either it's factorable or not :)

[LostGlade]

I bet the one dislike is from a teacher who's students were learning better from you... Nice job btw :) Really helped me out.

[Quichey]

@acdp61 Ah, yes.

You know the equation is factorable when in the equation Ax^2 + Bx + C, the factors of AC can add up to B, and then divide out A. e.g. 3x^2 + 5x - 8, 3x8 = 24, and 24 can be written as 1x24, 2x12, 3x8, and 4x6. 3x8 works well, so ((3x-3)(3x+8))/3 = (x-1)(3x+8)

Completing the square might be preferable to the Qformula if A = 1 and B is an even number. Otherwise, just Qformula it.

[PurpHD]

You are way more helpful than my teacher. Thank you.

[AaronGirma]

This guy is a genius. I've been struggling with this for a while and I found the right video. Thanks +patrickJMT

[sourpatchkid]

great! so helpful. thank you! i liked how you used different colors it helped

[Derekjetaa]

he did this in sharpie.. That's confidence.

[SanchiOberoi]

@selistar1000 multiplying by 1/2 is the same as dividing something by 2. But, dividing something by 1/2 is a completely different thing. In that case, you take the reciprocal of 1/2, which is 2 and multiply by the number given.
- 4 x 1/2 = 2 but 4 divided by 1/2 = 4 x 2 = 8
:)

[xXmgZrXx]

Thanks! Very clear, I now understand it much better :)

[twizyxgrafixz]

I really appreciate the time and effort you put into these videos, but I have a suggestion. My teacher loves fractions and he gave me this to solve... 1/3b^2 - 1/2b=2 ... and it is very confusing for me. I am sure others would like to see a problem such as this. Thank you again for the great help, it is much appreciated.

[CrysHBIC]

You're a fabulous teacher!! :)

[KikiDaily]

thanks dude, you are the one that can explain it more clearly... I appreciate your work dude...

[selistar]

@patrickJMT hii =) i have a question... i don t understand why you say to take one half of the fraction and you multiply... isnt it supposed to divide??? i mean is not only what you say, this is how it is, but I cant really get it.

[Dklew]

you my friend may have saved me on the final!

[hinicc]

OMG! I wish I saw this video earlier since my Pre-cal final was yesterday. And there were problems with completing the square :(