Solve 5x - 4 = 7 for x using the change of base formula log base b of y equals log y over log b.

A 5.209

B 4.827

C - 2.791

D - 3.173

5.209 or A

Step-by-step explanation

5^x-4=7

reserve 4

log sides

x-4 log5 and log7

x-4=log7/log5

+4 or number of your equation

x=log5/log7 + 4

use calculator

get answer

5.209

EDIT: Got a 100 on the test this is correct