Saturday

February 28, 2015

February 28, 2015

Posted by **Samir** on Thursday, January 24, 2008 at 11:29am.

Both of them are base 10

- advanced fuctions -
**jAKE1214**, Thursday, January 24, 2008 at 1:22pmI haven't done log for a while, but can't you just use subsitution and set up an equation like this?

log(x-2)=1-log(x+1) and then solve for x?

log(x-2)+log(x+1)=1 and I think there's a rule that let you combine those... like multiplying them or something and go from there. Or if you have a graphing calculator, just use that to find the intersections for checking your answer.

- advanced fuctions -
**Reiny**, Thursday, January 24, 2008 at 3:35pmJake is on the right track, from his

log(x-2)+log(x+1)=1

log((x-2)(x+1))=1

log(x^2 - x - 2) = 1

x^2 - x - 2 = 10^1

x^2 - x - 12 = 0

(x-4)(x+3) = 0

x = 4 or x = -3, but x > -1 for log (x+1) to be defined,so

x = 4

**Answer this Question**

**Related Questions**

Advanced Functions/ Precalculus Log - 1. Evaluate 4^(log base4 64) + 10^(log100...

Algebra 2 - -Explain the difference between log base b (mn) and ( log base b of ...

math - Logarithm!!! Select all of the following that are true statements: (a) ...

check! - here is the question: log5(x-4)= log7x solve for x. These are just base...

math - write as a single logarithm: -2logbase3(1/x)+(1/3)logbase3(square root of...

math(Please help) - 1) use the properties of logarithms to simplify the ...

Trig - log base b 64 - log base b 16 = log base 4 16 solve for the variable.. i...

Math Help Please - Which of the following expressions is equal to log (x sqrt-y...

math - mathematically Evaluate without using tables 2 log base 10 raised 2 power...

advanced algebra - we are working with logarithms and i dont understand them at ...