Question

Find the exact answer.
log8(7x+1) = -2

Answer 1

That 8 is the base of the log, right?

Answer 2

yes

Answer 3

ok, watch and learn, my dear...

Answer 4

alrighty

Answer 5

log8 (x²-7x)=1
x²-7x = 8
x²-7x-8 = 0
x²-8x+x-8 = 0
x(x-8)+1(x-8) = 0
(x+1)(x-8) = 0
x = {-1,8}