Question

solution to the equation 25^(z – 4) = 125 ?

Answer 1

You must use logarithms. danielcoolxx, 25 is being raised to a power, not multiplied; therefore your method is not correct.

Answer 2

re-write the equation in terms of powers of 5

\[(5^2)^{z - 4} = 5^3\]
using the power of a power law

\[5^{2x - 8} = 5^3\]

then equate the powers

2x - 8 = 3

2x = 11

x = 11/2

Answer 3

oops changed variables from z to x... sorry about that