Answers

2015-02-28T21:25:29+05:30

This Is a Certified Answer

×
Certified answers contain reliable, trustworthy information vouched for by a hand-picked team of experts. Brainly has millions of high quality answers, all of them carefully moderated by our most trusted community members, but certified answers are the finest of the finest.
M = log 20 

n = log 25

so 2log (x - 4) = 2m - n

⇒  log (x - 4)² = 2log20 - log25

⇒ log(x - 4)² = log (20² / 25)

cancelling log from both sides

(x - 4)² = 20² / 25 

⇒ x - 4 = 20 / 5

x = 4 + 4 = 8 ANSWER

1 5 1
answer is not correct. the correct answer is x = 8
2015-03-02T11:25:18+05:30
2log(x-4) = 2m-n
log (x-4)² = 2log20 - log 25
log (x-4)² = log20² - log25
log(x-4)² - log(20²/25)
⇒ (x-4)² = (20/5)²
x - 4 = 4 
x = 8
0