Question

Factor the trinomial
r^2-11r+24

Answer 1

(r-3)(r-8)

Answer 2

Thank you

Answer 3

???

Answer 4

I thought I showed you the steps

Answer 5

You should be checking answers at this point

Answer 6

By the way you check answers by FOILING the factored form back out again

Answer 7

right I have a about 15 of these

Answer 8

working on some of them now with the concept you showed me Hero it is working

Answer 9

do not need help for the moment

Answer 10

If you ever find yourself really stuck you can always use the following formula to factor quadratics. This is based on the quadratic formula, which, if you haven't learned/memorized already, will have to at some point anyway. :P (so, you might as well!) \[ax^2+bx+c=\displaystyle a\left(x+\frac{b+\sqrt{b^2-4ac}}{2a}\right)\left(x+\frac{b-\sqrt{b^2-4ac}}{2a}\right)\]As an exercise, you should distribute the terms on the right-hand side to check that it's really the proper factorization. If you have't seen it before, for your own edification, the Quadratic Formula is below, which gives the solutions to the equation \(ax^2+bx+c=0\). It's an equation I learned in 9th grade and it comes up a lot.\[\displaystyle x=\frac{-b\pm\sqrt{b^2-4ac}}{2a}\]If you get a negative number as \(b^2-4ac\) (under the square root), that means that your equation is not factorable unless you use imaginary numbers (which, for most middle school/high school classes, means it's not factorable). I know these formulas look daunting at first, but trust me, they're very useful, and I encourage you to get some familiarity with them.

Answer 11

(i wil give u a medal for that) ^

Answer 12

Thank you! :-)

Answer 13

@yakey, how do u write b^2-4ac in that same line?

Answer 14

saifoo.khan - Surround with \( brackets instead of the \[ ones. The latter make "display style" equations while this other one does specifically "inline" equations.

Answer 15

can't do it. :/

Answer 16

20b^2+11b-3
=(20b+1)(b-3)

Answer 17

You need to close them too with \) just like the other ones. I couldn't put both the open and close in the same post because it thought I was doing math in between.

Answer 18

\[(4 b+3) (5 b-1) \]

Answer 19

how?
answer = \( Kewl\)

Answer 20

@Marv06 - That factorization isn't quite correct.

Answer 21

i just want to know how u got the 4

Answer 22

i'm getting dizzy lol

Answer 23

4 and 5 are factors of 20 that happen to produce nice whole numbers when you factorize.

Answer 24

oh ok

Answer 25

By the way you check answers by FOILING the factored form back out again

Answer 26

Marv, remember when I was telling you that once you put a number in front of the first term, everything changes? Well, that's what happened and you didn't give me a chance to show you

Answer 27

I apologize

Answer 28

I'm still working on a few now on the ones I know so far

Answer 29

28s^2-37s-21

Answer 30

Yes, I need to go over that one with you

Answer 31

Come back to skype.

Answer 32

And bring a notepad

Answer 33

ok

Answer 34

let me take a smoke brake
my nerves is getting bad lol

Answer 35

break

Answer 36

smoke break?

Answer 37

really?

Answer 38

ok back

Answer 39

I'm already on

Answer 40

HA!