# Anybody Here Good At Math? I Need Some Help.

Discussion in 'Lounge' started by Aussie, Oct 14, 2010.

1. ### Aussie Well-Known Member

Aug 11, 2010
86
0
0
School.
#1
I forgot everything from last year in 8th grade, I am now in integrated Algebra 1. I had all A's last year and now I have a D in this class. If anyone here is smart can you please show me some work on how to do these problems. No flaming, please

1. -x + 4y - 7x +8y + (-3x) - 2y
2. (2/3)(-2/5)(2/7)

2. ### da shiz wiz 19 Well-Known Member

Sep 24, 2009
7,318
0
0
#2
Last edited: Oct 14, 2010
(2/3)(-2/5)(2/7) = (2*-2*2)/(3*5*7) = (-8/105)

No thank you neccessary

EDIT: I would help if you told us what we're trying to solve for and what the fraction in 2 are.

3. ### 270Kp Well-Known Member

Oct 27, 2009
1,475
0
0
Beta-Tester
USA
#3

Jk, wish I could help you but I haven't taken math since freshmen year.

Aug 11, 2010
86
0
0
School.
#4
No

5. ### Spaztrigger Well-Known Member

Apr 4, 2010
471
0
0
#5
Isn't this distributive property? Then what you need to do is group all the x's together and all the y's together

6. ### Booch138 Well-Known Member

Apr 28, 2009
5,937
2
38
Data-Entry Operator
Coolidge, AZ
#6

I u sed to be so good at math.

Then I found pot.

7. ### Rocketman919 Well-Known Member

Aug 8, 2008
2,302
1
0
Cali-forn-i-a
#7
dude you've got to be kidding me if you can't do this. Looks like your perfect life is going to come crashing down because you are terrible in the one subject that is actually useful in life.

8. ### Mew2468 Well-Known Member

Oct 20, 2008
1,652
0
0
Vancouver, BC
#8
-x + 4y - 7x + 8y + (-3x) - 2y =
-x + 7x + -3x + 4y + 8y + -2y =
3x + 10y

I believe this is correct.

9. ### LBG Señor Member

Apr 19, 2009
7,471
0
0
31.560499, -111.904128
#9
Don't say we didn't warn you

10. ### Somerandomdude Well-Known Member

May 31, 2009
5,195
0
0
Doing nothing of importance.
Somewhere
#10
First we have a thread about how great his life was and how it would eventually crash, and now we have the actual downfall thread! Woohoo!

11. ### da shiz wiz 19 Well-Known Member

Sep 24, 2009
7,318
0
0
#11
No wonder his life was great...his homework involves adding, subtracting and multiplying.

12. ### Somerandomdude Well-Known Member

May 31, 2009
5,195
0
0
Doing nothing of importance.
Somewhere
#12
No kiddin man... I didn't actually take a look at it since it was solved by the time I checked this out, but it looked pretty easy.

Ohhhh... he's gonna have a ton of fun going through Algebra 2...

Jul 22, 2009
1,398
0
0
#13
1 + 1 = 2

14. ### LBG Señor Member

Apr 19, 2009
7,471
0
0
31.560499, -111.904128
#14

15. ### sammysin Well-Known Member

Feb 23, 2010
8,375
0
0
Government Official.
Swansea, UK
#15
ROFL, love this.

Jul 22, 2009
1,398
0
0
#16

17. ### doodlejumper Well-Known Member

Jan 27, 2010
2,881
0
0
Stuck in traffic
#17
There IS a math class social group you know.

18. ### B34\$T Well-Known Member

Aug 10, 2009
1,185
0
0
#18
I love doing derivatives!

Ok so:
Y= -x + 4y - 7x +8y + (-3x) - 2y
Therefore
y'= -1dx/dy + 4 -7dx/dy + 8 -3dx/dy- 2

y'= -11dx/dy +10

Derivative of #2 would just equal 0.

Happy to help.

19. ### da shiz wiz 19 Well-Known Member

Sep 24, 2009
7,318
0
0
#19
Last edited: Oct 14, 2010
lmfao.

But you can't do that, silly. It would have to be implicit differentiation and you would have to make the y into y primes (ex: 4y -> 4y' not 4). Then solve for y prime like algebra. Or you could first solve for y in terms of x and then find the derivative.

20. ### B34\$T Well-Known Member

Aug 10, 2009
1,185
0
0
#20
You need to go back to math class because you need to freshen up on your power rule.

here is an example:
Derivative of 4x^3
4(3x^2)
12x^2

Because 4y is really 4y^1
The power rule makes it 4(1y^0)
Anything to the power of 0(except 0) is equal to 1.
4*1*1=4