Question

log₅(x-3)+log₅x=log₅4
how do i solve this?

Answer 1

base is 5 ?

Answer 2

yes

Answer 3

u know the properties of logarithm, @mathnoob1 ?

Answer 4

well doesnt matter..
use this,,log a +log b = log ab
and if log m = log n
then m=n
try now
note : the bases should be equal here..

Answer 5

if apply the properties, u will get x(x-3)=4
now, solve this

Answer 6

x²-3x=4 ???

Answer 7

factor your equation

Answer 8

roots will be 4 and -1
but u have to discard -1 as log of negative number is not defined
so, the answer will be 4

Answer 9

hmm icic thank you everyone =)

Answer 10

@ninhi5 , u r wrong

Answer 11

i see

Answer 12

how do u define log(-2), @ninhi5 ?

Answer 13

@Arnab09 is right.

Answer 14

x.(x-3)=4

Answer 15

well guy the answer for this is 4.. and aranb09 answer it right

Answer 16

x>0 and x-3>0

Answer 17

checking doesn't matter

Answer 18

so x=4

Answer 19

guy this kind of equation can i actually use quadratic equation to solve it?

Answer 20

haha it's late at night

Answer 21

gr8.. good night