please help me with this i need to do good on a test tomorrow
Do you have any idea what to do?
um not really, im sorry... i wasnt at school the day of this lesson
1. Make the equation equal to \(0\) first. Since it is \(x^2-2x=24\), make it equal to zero by SUBTRACTING \(24\) on both sides.|dw:1442444154016:dw|
Do you understand so far?
If you understand it, what would now the equation be?
Now let's factor this equation. :) What two numbers will you MULTIPLY to get \(24\)?
6 and 4, right?
6 and 4 are partially correct! But if you add 6 and 4, would you get -2? Yes or no?
Yes! -6 and +4 :D
Now solve for x. |dw:1442444656142:dw|
ok, i kinda get it but i have a question. if you added 6 and 4, why would you get -2?
When you \(6\) and \(4\) you will not get -2, but you will get 10 because \(\huge 6+4=10\).
But when you add \(-6\) and \(4\), you'll get -2. \(\huge -6+4=-2\)
well yes XD so you're trying to get to -2 as well?
Like that is your goal?
Yes! You want to get -2 when you add them and at the same time get -24 when you multiply them. :D
ohhh, ok that makes sense now...
Okay, back to this. :) |dw:1442445006629:dw|
Find x. |dw:1442445027766:dw|
so are you now trying to get to -24? so the answer would be x=6,-4?
"so are you now trying to get to -24?" No. We've already done that because \(\huge (-6)(4)=-24\)
"so the answer would be x=6,-4? CORRECT! We're trying to solve for x. :)
For further references here's a link in factoring trinomials: https://www.youtube.com/watch?v=Nj9GgAM-dTQ Enjoy Algebra!
oh ok thank you?
You are welcome! :D