Posted by **Rebekah** on Monday, November 19, 2012 at 8:28pm.

how do you find x in 7-=log(x/10^-12)

- Precalc -
**Reiny**, Monday, November 19, 2012 at 9:20pm
I will assume that -= is a typo and should be just =

7 = log(x/10^-12)

7 = logx - log 10^-12

7 = logx - (-12)

7-12= logx

-5 = logx

x = 10^-5

- Precalc -
**Rebekah**, Monday, November 19, 2012 at 10:11pm
the thing is its / instead of - so I thought that I multiply each side by 10^-12 but im not sure

- Precalc -
**Steve**, Tuesday, November 20, 2012 at 12:22am
you cannot multiply by 10^12 because that is inside the log.

suppose you had 2 = √(x/4)

You can't multiply by 4, giving

8 = √x

because that would be trying to slide a value through the "walls" of the function calculation

## Answer this Question

## Related Questions

- precalc - If g(x = log subscript 7 x then what is the value of g(1/49)? I ...
- Precalc - 1. 1/3log base 8 of (x+1)=2log base 8 of 3-(2/3)log base 8 of (x+1) 2...
- math - Logarithm!!! Select all of the following that are true statements: (a) ...
- precalc help - Find the exact value without a calc 1. log base 3 of 8 times log ...
- Precalc - Solve for x log[1/3](x^(2) + x) - log[1/3] (x^(2) - x) = -1 Steps too ...
- Precalc - 1. Solve log (4x) = log (2) + log (x-1) the fact that this is x-1 and ...
- Precalc - how to write each expression into a single logarithm. 3log[4]x^(2) + (...
- Precaculculus - Suppose you are told that log(2)=0.3562 and log(3)=0.5646. All ...
- Precalc - Solve for x log[1/3](x^(2) + x) - log[1/3] (x^(2) - x) = -1 Steps too ...
- Math Help Please - Which of the following expressions is equal to log (x sqrt-y...

More Related Questions