Solving Logarithmic Equations for Homework Help

[enibaraliu]

Is log49/4+log9/35-log21/10 = log2/3 ?

I've tried and I'm here 2log1/5+2log2/5-log7=log2/4 , if I didn't do anything wrong, but I don't know what to do then , please help me !

 

[mgb_phys]

log(a) + log(b) = log(ab) is one of the useful properties of logarithms

 

[HallsofIvy]

Is log49/4+log9/35-log21/10 = log2/3 ?

I've tried and I'm here 2log1/5+2log2/5-log7=log2/4 , if I didn't do anything wrong, but I don't know what to do then , please help me !

Please use parentheses! Does "log1/5" mean log(1/5) or log(1))/5? And please show how you got that result.

 

[tiny-tim]

Hi enibaraliu!

Is log49/4+log9/35-log21/10 = log2/3 ?

I've tried and I'm here 2log1/5+2log2/5-log7=log2/4 , if I didn't do anything wrong, but I don't know what to do then , please help me !

erm … log A + log B = log AB

log A - log B = log A/B

Try again!