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algebra/trig2
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jj16802
Fangy
Jewelz
Justice
Ahmed
preid1220
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algebra/trig2
well as it goes, i forgot most of what i sleep threw last year due to staying up multiple days in a row, so this will be my all purpose cry for help =D . first order of business, does anyone know how to do this problem, and if you do can you give me the steps to do it?
x^2-2x>0
^i am sure i look like an idiot right now lol.
x^2-2x>0
^i am sure i look like an idiot right now lol.
preid1220- NH Moderator
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Re: algebra/trig2
Yes you do look like an idiot. BUT luckily Im here to help
Lol JK
What exactly is the question asking?
Lol JK
What exactly is the question asking?
Ahmed- NH Admin
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Re: algebra/trig2
i need to find x, and i just cant get my head quite around foiling, i blame the idiot who sits next to me and needs the teacher attention 24/7
preid1220- NH Moderator
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Re: algebra/trig2
x^2-2x>0
x(x-2)>0
Break it into intervals (-∞,0)∪(0,2)∪(2,∞+)
and you pick a number from each interval to check which satisfy it.
so.....
Pick -10 for the first interval
(-10)(-10-2)>0
true! thus we know (-∞,0) is one interval
Pick 1 for(0,2)
(1)(1-2)>0
false!
thus we know (0,2) is not one interval
pick 100 for the final interval
(100)(100-2)>0 true!
Thus the answer is (-∞,0]∪[2,∞+)
[ means inclusive and ( means exclusive
If you have any questions post
x(x-2)>0
Break it into intervals (-∞,0)∪(0,2)∪(2,∞+)
and you pick a number from each interval to check which satisfy it.
so.....
Pick -10 for the first interval
(-10)(-10-2)>0
true! thus we know (-∞,0) is one interval
Pick 1 for(0,2)
(1)(1-2)>0
false!
thus we know (0,2) is not one interval
pick 100 for the final interval
(100)(100-2)>0 true!
Thus the answer is (-∞,0]∪[2,∞+)
[ means inclusive and ( means exclusive
If you have any questions post
Justice- NH Member
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Re: algebra/trig2
x^2-2x>0
x(x-2)>0
x>2
x^2-2x<0
x(x-2)<0
x=1
This is if I remember everything correctly. I asked Lev to check.
x(x-2)>0
x>2
x^2-2x<0
x(x-2)<0
x=1
This is if I remember everything correctly. I asked Lev to check.
Ahmed- NH Admin
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Re: algebra/trig2
And he did it before me.
Take Lev's answer. My brain is still on vacation mode. Espcially with this lack of HW.
@Lev: You don't multiple the inequality by -1 to get the other answers?
Take Lev's answer. My brain is still on vacation mode. Espcially with this lack of HW.
@Lev: You don't multiple the inequality by -1 to get the other answers?
Ahmed- NH Admin
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Re: algebra/trig2
What grade are you in Ahmed? Your only in Algebra 2 :O
Jewelz- NH Member
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Re: algebra/trig2
I'm in AP Calculus AB
Ahmed- NH Admin
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Re: algebra/trig2
You should trust me...I told Ahmed of a dude who teaches this stuff listen to him....I am not sure if i can say his name
Last edited by Justice on Wed Sep 15, 2010 7:30 pm; edited 1 time in total (Reason for editing : Typing really fast lol)
Justice- NH Member
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Re: algebra/trig2
OK Lev
This isn't really hard...it's just that my brain is a bit rusty at the moment. Still need to go into school mode.
This isn't really hard...it's just that my brain is a bit rusty at the moment. Still need to go into school mode.
Ahmed- NH Admin
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Re: algebra/trig2
thanks Lev,thanks to you i see what i have been missing =D
preid1220- NH Moderator
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Re: algebra/trig2
Oh I remember doing this with Arjun now when he used to draw +s and -s on the ones that worked or not...
Well I'm in Cal now so w/e lol.
Anyways thanks for helping him out Lev the math noob.
Well I'm in Cal now so w/e lol.
Anyways thanks for helping him out Lev the math noob.
Ahmed- NH Admin
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Re: algebra/trig2
Lev's answer is so complicated. xD
|x| is greater than or equal to 2 is a million times easier to read.
|x| is greater than or equal to 2 is a million times easier to read.
Fangy- NH Retired Moderator
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Re: algebra/trig2
OMG please never remind me of this horrible class
jj16802- NH Moderator
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Re: algebra/trig2
jj16802 wrote:OMG please never remind me of this horrible class
bad day in math for you as well?
preid1220- NH Moderator
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Re: algebra/trig2
Couldn't get some of the problems, just like I did in 9th grade. It's the recipe for disaster.
jj16802- NH Moderator
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Re: algebra/trig2
Ask the teacher?
Ahmed- NH Admin
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Re: algebra/trig2
Ahmed IV wrote:Ask the teacher?
the teacher is useless lol.
preid1220- NH Moderator
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Re: algebra/trig2
Go to another math teacher.
Ahmed- NH Admin
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Re: algebra/trig2
Every math teacher I had in high schools makes more jokes than teach the actual stuff
jj16802- NH Moderator
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Re: algebra/trig2
^^^That's my orgo teacher.
Ahmed- NH Admin
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Re: algebra/trig2
reviving this, factor this completely so i can check myself
2x^2-18x-72
and
12x^3+2x-30x-5
also another inequality like before
|2x-7|<9
2x^2-18x-72
and
12x^3+2x-30x-5
also another inequality like before
|2x-7|<9
preid1220- NH Moderator
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Re: algebra/trig2
2(x-12)(x+3)
Did you write the second one correctly? Check it.
Inequality solution: 0 is less than or equal to x. x is less than or equal to 4.
Did you write the second one correctly? Check it.
Inequality solution: 0 is less than or equal to x. x is less than or equal to 4.
Ahmed- NH Admin
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Re: algebra/trig2
it's right
preid1220- NH Moderator
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Re: algebra/trig2
So why didn't you write: 12x^3+-28x-5 ?
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