[Dewo]

(x + 4)*2 + 4(x*2 + 2) > (x - 2)*2 + 4x(x + 2)


Post the whole process.

[antisickness]

x^2 +8x+16+4x^2+8 > x^2-4x+4+4x^2+8
= 5x^2+8x+24 > 5x^2+12
= 8x > -12
= x > -12/8

may have made mistake cause writing in comp aint mah thing.

jura ples

[5thnbg]

x^2 +8x+16+4x^2+8 > x^2-4x+4+4x^2+8
= 5x^2+8x+24 > 5x^2+12
= 8x > -12
= x > -12/8

may have made mistake cause writing in comp aint mah thing.

jura ples

The final result its -3/2

[mo9]

2x+8+8x+8 > 2x-4+4x (to the power of 2 lol) + 8x
10x+16 > 10x +4x (to the power of 2) -4
16-4 > 10x-10x + 4x (to the power of 2)
12 > 4x (to the power of 2)
3> x squared
Square root 3 > x

sowwy if i did anything wrong

(click to show/hide)

[antisickness]

mayb i did something wrong along the way... cba getting my pen and paper out tho rofl

[5thnbg]

(x + 4)*2 + 4(x*2 + 2) > (x - 2)*2 + 4x(x + 2)


Post the whole process.

(x + 4)*2 + 4(x*2 + 2) > (x - 2)*2 + 4x(x + 2)
x*2 + 8x + 16 + 4x*2 + 8 > x*2 - 4x +4 + 4x*2 + 8x
5x*2 + 8x + 24 > 5x*2 + 4x + 4
8x + 24 > 4x + 4
4x > -20
x > -5

P.S. : If there is something that we really do in the romanian schools...i can asure you thats math.

[Dewo]

(x + 4)*2 + 4(x*2 + 2) > (x - 2)*2 + 4x(x + 2)


Post the whole process.

(x + 4)*2 + 4(x*2 + 2) > (x - 2)*2 + 4x(x + 2)
x*2 + 8x + 16 + 4x*2 + 8 > x*2 - 4x +4 + 4x*2 + 8x
5x*2 + 8x + 24 > 5x*2 + 4x + 4
8x + 24 > 4x + 4
4x > -20
x > -5

P.S. : If there is something that we really do in the romanian schools...i can asure you thats math.

I hope, you are right.
Thanks to those who used some of their time to help me. I appreciate it.

[5thnbg]

(x + 4)*2 + 4(x*2 + 2) > (x - 2)*2 + 4x(x + 2)


Post the whole process.

(x + 4)*2 + 4(x*2 + 2) > (x - 2)*2 + 4x(x + 2)
x*2 + 8x + 16 + 4x*2 + 8 > x*2 - 4x +4 + 4x*2 + 8x
5x*2 + 8x + 24 > 5x*2 + 4x + 4
8x + 24 > 4x + 4
4x > -20
x > -5

P.S. : If there is something that we really do in the romanian schools...i can asure you thats math.

I hope, you are right.
Thanks to those who used some of their time to help me. I appreciate it.

Do the verification.. For example change x with -5 and then with -4...
Do i get jura or smthing?

[Yz]

**** uguys for helping dewo for free and not me for a jura+love

8====>heads

[mo9]

  this is way easier :p

[Toast]

i dunno buddy   

[Rossbach]

(x + 4)*2 + 4(x*2 + 2) > (x - 2)*2 + 4x(x + 2)

(x+4)(x+4) + 4x^2 + 8 > (x - 2) (x-2) +4x^2 + 8x  <---- Do not forget the middle terms. (x + 4)*2 is not x^2 + 4^2.

x^2 + 4x + 4x + 16 + 4x^2 + 8 > x^2 - 2x - 2x + 4 + 4x^2 +8x

5x^2 + 8x + 24 > 5x^2 + 4x + 4


4x > -20

x > -5

or:

20 > -4x

-20 < 4x

-5 < x

^ Note the change in > to < for future.

[Jeffalo13]

wolframalpha.com

[Rossbach]

wolframalpha.com

Ooo. Also there is this:
http://www.mathway.com
http://www.mathway.com/answer.aspx?p=calg?p=%28xSMB15+SMB154%29SMB072SMB15+SMB154%28xSMB072SMB15+SMB152%29SMB15SMB03SMB15%28xSMB15-SMB152%29SMB072SMB15+SMB154x%28xSMB15+SMB152%29?p=3?p=?p=?p=?p=?p=0?p=?p=0?p=?p=

[Pokeh]

you guys could've gave me those links before i failed math