Answer:
x = - 0.55 ( 2 dec. places )
Explanation:
Express
as
. 4² -
= 7
Factor out
from each term
( 4² - 1) = 7
× 15 = 7 ( divide both sides by 15)
=

Take the log ( base 10 ) of both sides
log
= log (
), thus
x log 4 = log (
) ( divide both sides by log 4 )
x = - 0.55