Is anyone good at logarithms?

  • 0 votes

Logarithms don't make sense to me.. 

I have the question : "Find the x-coordinate of the point where the graph of the curve with equation y=log3(x-2)+1 intersects the x-axis..

and I was wondering if anyone could help??...I'm pretty desperate! 

Posted Sat 24th March, 2012 @ 14:05 by HannahBanana

2 Answers

  • 1 vote

y=0 when the line crosses the x-axis.

log3(x-2)+1 = 0

log3(x-2) = -1

3^-1 = x-2    Remember   logA(B)=C    A^C=B

1/3 = x-2     

1/3 +2 = x

x = 7/3

Answered Sat 24th March, 2012 @ 17:15 by Maleficent
  • 0 votes

Thanks very much, I'd forgotten the rule that you used... I don't remember/understand any of the logarithm rules to be honest, thanks a lot!:)

Answered Sun 25th March, 2012 @ 16:58 by HannahBanana