9514 1404 393
Answer:
- product of powers
- power of a power
- negative exponent
Explanation:
The value in square brackets is evaluated using the product of powers rule:
(7^5)(7^3) = 7^(5+3) = 7^8
Then the overall value is found using the power of a power rule:
[7^8]^-4 = 7^(8(-4)) = 7^-32
Finally, the expression value is found using the negative exponent rule:
7^(-32) = 1/7^32 = 1/1104427674243920646305299201