Friday
March 24, 2017

Post a New Question

Posted by on Monday, April 9, 2012 at 9:05am.

I'm having a hard time with this problem. The book tells you the answer is 5, but I don't know how they got there.

log(x+25)= 1+ log(2x-7)

  • Math - , Monday, April 9, 2012 at 11:58am

    recall that log 1 = 10

    log(x+25) = log(10) + log(2x-7)
    log(x+25) = log(10(2x-7))
    x+25 = 10(2x-7)
    x+25 = 20x - 70
    19x = 95
    x = 5

    check:
    log(30) = 1 + log(3) = log(10)+log(3) = log(30)

Answer This Question

First Name:
School Subject:
Answer:

Related Questions

More Related Questions

Post a New Question