Question

solve for x: logx+log(x+21)=2

Answer 1

the answer is 4 I just don't know how to get there

Answer 2

log(y)+log(z)=log(yz)
tried to used that here

Answer 3

log[x(x+21)]=2

Answer 4

alexa have you made an attempt to solve the question?

Answer 5

yes i have and I come up with something completely different. im not sure whether to use the quotient, product, or power rule

Answer 6

combine the product and quotient rule

Answer 7

to get rid of the log write base 10 on both sides
so we have
x(x+21)=10^2

Answer 8

log(x(x+21)=2
logx^2+21x=2
=>10^2=x^2+21

Answer 9

ummmm 21x

Answer 10

100=x^2+21x

Answer 11

right

Answer 12

simple quadratics

Answer 13

alexa I hope its alright now... problem solved?

Answer 14

I can go from here, thanks

Answer 15

you're welcome :)

Answer 16

heyy btw alexa, you got msn or fb or some personal contact we can talk later, I'd appreciate it :/

Answer 17

hey alex make sure you check your answers because we can't have log(negative)

Answer 18

sorry but I dont like to give my personal information out unless I personally know the individual, no offense.

and thanks, I will.

Answer 19

np, understood :)