Well, I have a lot of work to do with my factoring "skills". That much I can say. Ouch! The silver lining is that I don't have to feel bad about getting this wrong because I'm not yet "good at factoring". It would help if someone explained to me why (a + 3) (a- 1) = (a square + 2a - 3). I get that a times a = a square and I get that 3 times minus 1 = minus 3. But I don't get the part about 2a. :( How 3 times a = 2a?
Use the FOIL method to multiply. You get a^2 -1a+3a-3. combine like terms and you get a^2+2a-3. After years of math, algebra, calculus, and differential equations I like to follow these to keep my math skills sharp - and most of them I can do in my head. This one I could not. This one is hard, I saw it probably involved 2x and 3y and a negative had to be involved somewhere but that is as far as I got without paper.
Needed paper and pencil for this one! (2x-3y+3)(2x-3y-1)
I tried but failed... will try again tomorrow.
(2x-3y-1)(2x-3y+3)
great lesson. i just missed one of the signs.
Well, I have a lot of work to do with my factoring "skills". That much I can say. Ouch!
The silver lining is that I don't have to feel bad about getting this wrong because I'm not yet "good at factoring".
It would help if someone explained to me why (a + 3) (a- 1) = (a square + 2a - 3).
I get that a times a = a square and I get that 3 times minus 1 = minus 3. But I don't get the part about 2a. :(
How 3 times a = 2a?
Use the FOIL method to multiply. You get a^2 -1a+3a-3. combine like terms and you get a^2+2a-3. After years of math, algebra, calculus, and differential equations I like to follow these to keep my math skills sharp - and most of them I can do in my head. This one I could not. This one is hard, I saw it probably involved 2x and 3y and a negative had to be involved somewhere but that is as far as I got without paper.
@@clintfell7668 Thank you! I'll work on my FOIL method. ;)
2:01 I almost made it, I got stuck at
(2x-3y2)(2x-3y)-3