+0

# Help Please!!!

+12
256
7
+1071

Find  when

Mar 14, 2020

### 7+0 Answers

#1
+22020
+1

2log(a - 2b)  =  log(a) + log(b)

log(a - 2b)2  =  log(ab)

(a - 2b)2  =  ab

a2 - 4ab + 4b2  =  ab

a2 - 5ab + 4b2  =  0

(a - 4b)(a - b)  =  0

Either  a = 4b   or   a = b                                  (It is impossible for a to equal b)

--->   a/b  =  1/4

Mar 14, 2020
#2
+1071
+7

Sorry, but 1/4 is incorrect.

Mar 14, 2020
#3
+113118
0

Why do you think so?

Geno justified his answer - you should justify your response.

Melody  Mar 15, 2020
#4
+1071
+8

I tried that answer, and it was incorrect.

SpongeBobRules24  Mar 15, 2020
edited by SpongeBobRules24  Mar 15, 2020
#5
+32112
+2

Geno made a slight slipup in the last line. He went from a = 4b to a/b = 1/4 instead of a/b = 4. If you had followed his reasoning instead of just looking at the final answer you might have spotted this!

Alan  Mar 15, 2020
#6
+1071
+8

I looked over his answer, and it is very easy to mix up the final answer. I have made that mistake on similar problems in the past, where I thought the answer was 1/5, but it was 5.

SpongeBobRules24  Mar 15, 2020
edited by SpongeBobRules24  Mar 15, 2020
edited by SpongeBobRules24  Mar 15, 2020
edited by SpongeBobRules24  Mar 15, 2020
#7
+113118
-1

If you had studied Gino's answer, understood it

Then done it yourself without looking at his.

You would have found the trivial error for yourself.

Melody  Mar 16, 2020