SOLUTION: Trying to figure out this problem: f(x)=6434x to the -4/3 power. x=18 I try 1/18 x 4/3 and get 13.5. That times 6434 = 86859, which is NOT the correct answer! Please help! Th

Algebra ->  Exponents-negative-and-fractional -> SOLUTION: Trying to figure out this problem: f(x)=6434x to the -4/3 power. x=18 I try 1/18 x 4/3 and get 13.5. That times 6434 = 86859, which is NOT the correct answer! Please help! Th      Log On


   

Question 229584: Trying to figure out this problem: f(x)=6434x to the -4/3 power. x=18
I try 1/18 x 4/3 and get 13.5. That times 6434 = 86859, which is NOT the correct answer! Please help! Thank you very much!!!! Steve
Answer by ankor@dixie-net.com(22740) About Me  (Show Source):
You can put this solution on YOUR website!
f(x)= 6434x to the -4/3 power. x=18
:
f%28x%29=6434x%5E%28-4%2F3%29
:
f%28x%29=6434%2A18%5E%28-4%2F3%29
reciprocal gets rid of the negative exponent
f(x) = 6434%2F%2818%5E%284%2F3%29%29
:
find 18^(4/3) on a calc
f(x) = 6434%2F47.1733
:
f(x) = 136.39
;
:
You can check this on a calc; enter: 6434*18^(-4/3) = 136.39