Loading [MathJax]/jax/output/SVG/jax.js
 
+0  
 
0
836
2
avatar+1124 

My second one for today:

 

Solve x:

 

2 Log x + 2 = log 900

 

I said:

 

LogX2+2=Log302

2Logx2Log30=2

2Logx30=2

60Logx=60

Logx=1

x=101

x=110

 

Is this correct?

 

wink

 Nov 13, 2019

Best Answer 

 #1
avatar+33654 
+3

You go wrong on your fourth line.    Check:  2log(1/10) +2 =0     log(900) =  2.954

 

2log10x+2=log109002log10x+2=log103022log10x+2=2log1030log10x+1=log1030log10x+log1010=log1030log10(10x)=log103010x=30x=3

 Nov 13, 2019
 #1
avatar+33654 
+3
Best Answer

You go wrong on your fourth line.    Check:  2log(1/10) +2 =0     log(900) =  2.954

 

2log10x+2=log109002log10x+2=log103022log10x+2=2log1030log10x+1=log1030log10x+log1010=log1030log10(10x)=log103010x=30x=3

Alan Nov 13, 2019
 #2
avatar+1124 
+1

Alan,

 

thanks again...I understand my error...thanx a million!

juriemagic  Nov 13, 2019

1 Online Users

avatar