SOLUTION: CAn someone please help me? I keep trying these but I also keep getting different answers:( a) [16^(1/2) +(2/3)^0]^-2 b)(27/8)^(1/3) + 4^-1 c)(7^0 - 4^-1)^-3

Algebra ->  Exponents -> SOLUTION: CAn someone please help me? I keep trying these but I also keep getting different answers:( a) [16^(1/2) +(2/3)^0]^-2 b)(27/8)^(1/3) + 4^-1 c)(7^0 - 4^-1)^-3      Log On


   



Question 271060: CAn someone please help me? I keep trying these but I also keep getting different answers:(
a) [16^(1/2) +(2/3)^0]^-2
b)(27/8)^(1/3) + 4^-1
c)(7^0 - 4^-1)^-3

Answer by ankor@dixie-net.com(22740) About Me  (Show Source):
You can put this solution on YOUR website!
Remember any number raised to the power of 0 = 1
:
a) [16^(1/2) +(2/3)^0]^-2
[16^(1/2) + 1]^-2
The exponent of 1/2 is the square root of the number
(4 + 1)^-2
5^-2
The reciprocal gets rid of the neg
1%2F5%5E2 = 1%2F25
:
:
b)(27/8)^(1/3) + 4^-1
Take the cube root of both numerator and denominator
3%2F2 + 1%2F4 = 6%2F4 + 1%2F4 = 7%2F4
:
:
c)(7^0 - 4^-1)^-3
(1 - 1%2F4)^-3 = (3%2F4)^-3 = (4%2F3)^3
cube both the numerator and denominator
64%2F27