SOLUTION: 2/3x^2 + x - 1, x = 1/2 2/3 (1/2)^2 + 1/2 - 1 I used the website and got the answer of .3333333, but I'm not sure why or how that is the answer? I'd appreciate any guidance..

Algebra ->  Expressions -> SOLUTION: 2/3x^2 + x - 1, x = 1/2 2/3 (1/2)^2 + 1/2 - 1 I used the website and got the answer of .3333333, but I'm not sure why or how that is the answer? I'd appreciate any guidance..      Log On


   

Question 886930: 2/3x^2 + x - 1, x = 1/2
2/3 (1/2)^2 + 1/2 - 1
I used the website and got the answer of .3333333, but I'm not sure why or how that is the answer? I'd appreciate any guidance...
Thanks!
Scott
Answer by josgarithmetic(39628) About Me  (Show Source):
You can put this solution on YOUR website!
"The website"? How and why? You only need basic computation knowledge. Maybe some knowledge about order of operations.

%282%2F3%29%281%2F2%29%5E2%2B1%2F2-1
%282%2F3%29%281%2F4%29%2B1%2F2-1
%282%2A1%29%2F%283%2A2%2A2%29%2B1%2F2-1
%281%2F6%29%2B1%2F2-1, now you need LCD, here being 6.
1%2F6%2B3%2F6-6%2F6
%281%2B3-6%29%2F6
-2%2F6, reduces to....
highlight%28-1%2F3%29 which is the opposite of what your website told you.