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View Full Version : Algebra Hlep Please

maximan1
04-03-08, 07:57 PM
Hlep me with this Albebra.
This is not factorable, correct?

30x squared + 11x - 30 = 0

It is not factorable, right?

cal_gundert05
04-03-08, 08:10 PM
Incorrect.

(5x+6)(6x-5)

maximan1
04-03-08, 08:10 PM
Thanks

maximan1
04-03-08, 08:11 PM
Can you explain por favor?

free_pizza
04-03-08, 08:12 PM
Can you explain por favor?

oh god... do some #\$%ing reading in your book, and dont say it doesnt explain it...

maximan1
04-03-08, 08:15 PM
oh god... do some #\$%ing reading in your book, and dont say it doesnt explain it...

What is this "reading" you speak of?

skinnyone
04-03-08, 08:24 PM
(-b +- sqrt( b^2 - 4ac))/2a will also tell you of its factors.

maximan1
04-03-08, 08:32 PM
The QUADRATIC FORMULA didn't work for me.

cal_gundert05
04-03-08, 08:37 PM
The factors, if any, would be of the form (Ax+B) and (Cx+D), where

AC=30

BD=-30

There aren't many pairs of numbers that, when multiplied together, give you 30. These pairs are 1 & 30, 2 & 15, 3 & 10, 5 & 6. One of those pairs will be your choice for A & C, and one pair (possibly the same pair) will be your B & D (actually, B or D will be the negative of one of the numbers in one of the pairs).

You just have to start testing different combinations of these pairs. You don't even need to worry about the negative sign at first. Just look for pairs such that the product of one number in one pair and one number in the other pair is 11 away from the product of the other number in each pair. For example, take the pairs 5 & 6 and 5 & 6. 5*5=25, 6*6=36. Their difference is 11.

Go on to figure out where the negative sign goes.

skinnyone
04-03-08, 08:37 PM
The QUADRATIC FORMULA didn't work for me.

How so?

-11 +- sqrt(121+3600)/60 right? whats not working in that equation?

it gives you (-11+- 61)/60 which yields 5/6 and 6/5

x=5/6 => 6x-5=0
x=6/5 => 5x-6=0

Tom Stormcrowe
04-03-08, 08:39 PM
Why are you doing his homework? Cryptic hints and guidance is what he needs ;) That way he thinks it through and really learns :D

maximan1
04-03-08, 08:45 PM
Why are you doing his homework? Cryptic hints and guidance is what he needs ;) That way he thinks it through and really learns :D

I have everything done except for this problem, I got stuck on it. I was studying for finals (tomorrow) and I couldn't get past this.

Tom Stormcrowe
04-03-08, 08:49 PM
Teasing you Max ;)

You'll kick butt on the exam....relax and do the easy problems first and then go back and rework the problems you got stuck on. That way, you'll get more done if you run into time issues. Also, the easier problems will often give you hints on the harder ones. ;) Strategy AND knowlege.

I have everything done except for this problem, I got stuck on it. I was studying for finals (tomorrow) and I couldn't get past this.

maximan1
04-03-08, 08:54 PM
Teasing you Max ;)

You'll kick butt on the exam....relax and do the easy problems first and then go back and rework the problems you got stuck on. That way, you'll get more done if you run into time issues. Also, the easier problems will often give you hints on the harder ones. ;) Strategy AND knowlege.

All problems are easy problems for me

Tom Stormcrowe
04-03-08, 09:11 PM
All problems are easy problems for me

Except the one you just got stuck on......:p

maximan1
04-03-08, 09:12 PM
Except the one you just got stuck on......:p

Nah, I was just testing you guys ;)

free_pizza
04-03-08, 09:16 PM
You'll kick butt on the exam.
Nope. He just wont.

maximan1
04-03-08, 11:46 PM
Nope. He just wont.

You fail at life.

Go die.

I am offended by your comment.

mlts22
04-03-08, 11:49 PM
Any polynomial that can be expressed in "Ax^2 + Bx + C" (assuming A, B, and C are rational numbers) can be factored via the quadratic formula. It may be ugly, bristling with square roots, but it can be done.

fuzzbox
04-03-08, 11:50 PM
You spelt help wrong, what do you expect?

maximan1
04-03-08, 11:51 PM
You spelt help wrong, what do you expect?

I did that on purpose.

fuzzbox
04-03-08, 11:53 PM
And Algebra too, right? Of course what was I thinking.

trsidn
04-04-08, 07:55 AM
The QUADRATIC FORMULA didn't work for me.

jsharr
04-04-08, 08:05 AM
I did that on purpose.

http://www.freefoto.com/images/14/19/14_19_53---The-Leaning-Tower-of-Pisa--Tuscany--Italy_web.jpg

yeah, so did these guys.

skinnyone
04-04-08, 08:09 AM

:roflmao:

junkyard
04-04-08, 10:59 AM
I suggest you drop out of high school and become a derelict.

wethepeople
04-04-08, 05:00 PM
You fail at life.

Go die.

I am offended by your comment.

Get banned plz.

maximan1
04-04-08, 06:17 PM
Get banned plz.

I refuze

Hickeydog
04-04-08, 06:25 PM
Can you explain por favor?

With an equation like that, the best thing I can come up with is just guess and check. Start guessing numbers that you think look right and then check to see if you get the original equation out. I know, it takes long and you sometimes do not get the right answer, but that's the only way I know how to do it.

maximan1
04-04-08, 08:09 PM
With an equation like that, the best thing I can come up with is just guess and check. Start guessing numbers that you think look right and then check to see if you get the original equation out. I know, it takes long and you sometimes do not get the right answer, but that's the only way I know how to do it.

I passed my midterm YAY

My teacher says he thinks its about 94%

Little Darwin
04-04-08, 08:18 PM
I passed my midterm YAY

My teacher says he thinks its about 94%

So, your math teacher doesn't know percentages well enough to be sure?

:D

referee54
04-04-08, 08:32 PM
I gotta tell you folks, math scares the poop out of me. When I took statistics in grad school I though I was going to have a nervous breakdown. Thank goodness I teach English and speech...

Math to me is the "evil empire."

Tim C.

b_young
04-04-08, 09:30 PM
AHHHH. F.O.I.L.ed again.