Question

Logarithmic equation

Solve
(Posting in a moment)

Answer 1

\[\log_{10} z+ \log_{10} (z+3) = 1\]

Answer 2

Use this property..
log a (b) + log a (c) = log a (b*c) and solve.

Answer 3

you can write this as \[\log_{10} (z \times (z+3)) = 1\]

Answer 4

Okay thanks, one sec.

Answer 5

\[so, z(z+3) = 10\]

Answer 6

You than have to solve a quadratic.

Answer 7

okay im trying to solve just gimme a sec XD

Answer 8

I got z=2

Answer 9

Yes correct

Answer 10

bravo

Answer 11

@ mebs... can you explain why -5 isn't valid...?

Answer 12

@campbell_st It is... I didn't check lol...

Answer 13

Alright.. Never mind... there is one more solution..

Answer 14

ok