Please solve (-2)^3 (-K-|-3|) - (-2) -2K = K -3^2

S

Spencer Heisel

New member
Joined
Apr 1, 2008
Messages
8
(-2)^3 (-K-|-3|) - (-2) -2K = K -3^2

I know answer should be -7

If everything I think should be + is - and everything I think is - is + I can get the right answer.
I don't understand how I am getting everything backwords.

I get

(-8) (-K-|3|) - (-2) -2K = K - 3^2

8K +24 +2 -2K = K9
6K + 26 = K9
5K = 17
k = 17/5

So what am I doing incorrectly?
 
Re: Please solve

Spencer Heisel said:
(-2)third power (-K-I-3I) - (-2) -2K = K - 3 second power
Click to expand...
CLARIFY that!
What is (-K-I-3I) ?
Do you know what -2^3 equals?
 
Re: Please solve

Be more careful! Your k9 should be k - 9
 
Re: Please solve

Okay I'm confused. I thought a neg times a neg always gives a pos. Why is -3^2 = -9?
 
Spencer Heisel said:
Why is -3^2 = -9?
Click to expand...
Because - 3[sup:11oxl0xf]2[/sup:11oxl0xf] = - (3)(3) = -9. This is quite different from (-3)[sup:11oxl0xf]2[/sup:11oxl0xf] = (-3)(-3) = +9. :wink:

Eliz.
 
You must log in or register to reply here.
Top