anonymous
  • anonymous
solve for x: logx+log(x+21)=2
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
the answer is 4 I just don't know how to get there
myininaya
  • myininaya
log(y)+log(z)=log(yz) tried to used that here
myininaya
  • myininaya
log[x(x+21)]=2

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sasogeek
  • sasogeek
alexa have you made an attempt to solve the question?
anonymous
  • anonymous
yes i have and I come up with something completely different. im not sure whether to use the quotient, product, or power rule
sasogeek
  • sasogeek
combine the product and quotient rule
myininaya
  • myininaya
to get rid of the log write base 10 on both sides so we have x(x+21)=10^2
sasogeek
  • sasogeek
log(x(x+21)=2 logx^2+21x=2 =>10^2=x^2+21
sasogeek
  • sasogeek
ummmm 21x
myininaya
  • myininaya
100=x^2+21x
myininaya
  • myininaya
right
sasogeek
  • sasogeek
simple quadratics
sasogeek
  • sasogeek
alexa I hope its alright now... problem solved?
anonymous
  • anonymous
I can go from here, thanks
sasogeek
  • sasogeek
you're welcome :)
sasogeek
  • sasogeek
heyy btw alexa, you got msn or fb or some personal contact we can talk later, I'd appreciate it :/
myininaya
  • myininaya
hey alex make sure you check your answers because we can't have log(negative)
anonymous
  • anonymous
sorry but I dont like to give my personal information out unless I personally know the individual, no offense. and thanks, I will.
sasogeek
  • sasogeek
np, understood :)

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