Question

solve. 25^(z - 4) = 125

Answer 1

not one of my choices

Answer 2

i got -2.5

Answer 3

Start by taking the natural log of both sides. This will drop the exponent down so you can solve for z:
\[(z-4) \ln25 = \ln 125\]How can you solve for z now?

Answer 4

ad 4 to both sides

Answer 5

Not yet, first we have to get rid of the ln 25 on the left side. So we'll divide both sides by ln 25:
\[z-4=\frac{ \ln 125 }{ \ln 25 }\]

Answer 6

ooooh ok i see ya!