Question

log(x) + log(x-15) = 2

Answer 1

u want what?

Answer 2

Solve logx+log(x−15)=2.

Answer 3

I don't know the answer

Answer 4

can u help me

Answer 5

log(x(x-15))=2, using log rule

Answer 6

Use the identities of logarithms to rewrite it as:
log(x(x-15))=2
Then raise everything to the 10 (I'm assuming you mean log base 10).
x(x-15)=10^2
x^2-14x=100
x^2-14x-100=0
Use quadratic formula.

Answer 7

x(x-15)=10^2......log has base 10

Answer 8

thanks

Answer 9

No problem :P

Answer 10

u are very kind

Answer 11

Use the identities of logarithms to rewrite it as:
log(x(x-15))=2
Then raise everything to the 10 (I'm assuming you mean log base 10).
x(x-15)=10^2
x^2-15x=100
x^2-15x-100=0
x^2-20x+5x-100=0
x(x-20)+5(x-20)=0
(x-20)(x+5)=0
So, x=20 or -5