>in precalculus with other muck-dwelling brainlet scum
>in a study group, first I've ever been to
>work on the problem a little, end up getting x^-2 = 9
>everybody comes to a consensus that the answer is 3 because the square root of 9 is 3
>they tell me to double check my math because (1/81) seems way off
>tfw cursed with terminal brainletism
how the fuck do you do math? I read some of the stuff on here and I cant even comprehend where to begin with understanding it.
fucking awful bait
x^-2 = 9
(x^-2)^2 = 9^2
x = 9^2
x = 1/81
bravo
fyi
[math] x^{-y} = \frac{1}{x^{y}} [/math]
>I'm tooootally not just practicing LaTeX (I am)
No
x^-2=9
1/(x^2)=9
1=9x^2
1/9=x^2
x=1/81
I hope you're a freshman
x^-2 = 9
1/x^2 = 9
1/9 = x^2
sqrt(1/9) = sqrt(x^2)
1/3 = x
>why the fuck you be talking like this bro
>(x^-2)^2 = 9^2
>x = 9^2
Bruh.
Powers don't fucking work that way. Learn some fucking arithmethic before you come here posting shit.
Your friends are also retarded I mean god damn. Well, what did I expect. You are doing fucking pre-calc.
Do you know algebraically what negative exponents mean right?
[math]x^{-2} = 9[/math]
[math]\frac{1}{x^{2}} = 9[/math]
[math]\sqrt{x^{2}} = \sqrt{\frac{1}{9}}[/math]
[math]x = \frac{1}{3}[/math]
Don't worry they're brainlets too, the answer is [math] x=\frac{1}{3}[/math]
Don't fucking solve it for him man. I wanted OP to drown in his stupidity.
That was the only thing you noticed that was wrong with it?
Well, there is a mistake after that aswell but the first problem is that he can't into exponents.
;) Don't worry about it. I didn't include the [math]x^2 = \frac{1}{9}[/math] step.
>Pre calculus
Underage b&?
No, it's +/-(1/81)
X^-2 = 9
X^2 = 1/9
Sqrt(X^2) = sqrt(1/9)
X = 1/3
That makes x^-4 = 1/81
Answer is 1/3 you idiot.
Answer is +- (1/3 ) what the fuck you babbling about user?
Surely you guys aren't actually this retarded.
what the fuck is it then Einstein
[eqn] \pm \frac{1}{3} [/eqn]
>insulting other people whole doing precalc
better cut that smugness in the bud now otherwise you're never going to learn seriously