solve the equation
the 8 is little and lower a lil. sry i dont kno how to say it.
2007-11-18 10:19:20 · 7 answers · asked by dave h 1 in Science & Mathematics ➔ Mathematics
log base 8(2x-8)=log base 8(12)- log base 8(3)
division rule says:
log base 8(2x-8)=log base 8(12/3)
log base 8 cancels on both side so you have
2x-8=4
aaaaaaand solve it.
hint hint, add 8 to both sides...then you should figure out the rest
2007-11-18 10:23:52 · answer #1 · answered by alexie. 4 · 0⤊ 0⤋
log property is that those logs subtracting is like log8(12/3)
take 8^log8 and they'd cancel out. for all of them
left with:
2x+8 = 12 / 3
2x + 8 = 4
2x = -4
x = -2
2007-11-18 10:23:55 · answer #2 · answered by sweetslasher 2 · 0⤊ 0⤋
log8(2x-8) = log8(12/3)
2x-8 = 4
2x = 12
x=6
2007-11-18 10:23:11 · answer #3 · answered by ironduke8159 7 · 0⤊ 0⤋
x = -2
2007-11-18 10:37:35 · answer #4 · answered by Paddy 4 · 0⤊ 0⤋
it is said as log (2x-8) with base 8 ( i think that is what you mean!)
log8(2x-8)=logb(12/3) (because log a - log b =log(a/b)
taking antilog on both sides
2x-8=4
2x=12
x=6
2007-11-18 10:25:35 · answer #5 · answered by ba$$hunter 2 · 0⤊ 0⤋
all to base 8
log(2x --8) = log12 -- log3
=> log(2x --8) = log(12/3)
=> log(2x --8) = log4
=> 2x --8 = 4
=> 2x = 12
=> x = 6
2007-11-18 10:24:52 · answer #6 · answered by sv 7 · 0⤊ 0⤋
Dude we're doing this at school now... just tell me is that a multiplication sign or an X?!!!
2007-11-18 10:24:35 · answer #7 · answered by The Beast from the Middle East 5 · 0⤊ 0⤋