8^(3x+1)-8^(3x)=448
Please show your work too....
2006-10-03 10:05:58 · 5 answers · asked by jlanlu 1 in Science & Mathematics ➔ Mathematics
Use a^(x+y)=a^x*a^y:
8^(3x)*8^1 - 8^(3x) = 448
Factor:
8^(3x)(8-1)=448
Divide:
8^(3x) = 448/7 = 64
64=8^2, so you have
8^(3x) = 8^2
so
3x=2
meaning
x=2/3.
2006-10-03 10:13:15 · answer #1 · answered by James L 5 · 0⤊ 0⤋
8^(3x+1)-8^(3x)=448
8^(3x)*(8-1)=4488^3x * 7=448
8^3x=64
3x=ln64/ln8=2
x=2/3
check
8^(3*2/3+1)-8(3*2/3)=448
8^(3)-8^(2)=448
512-64=448
448=448
2006-10-03 18:29:05 · answer #2 · answered by yupchagee 7 · 0⤊ 0⤋
I'd prefer to correct your work rather than do it for you.
2006-10-03 17:09:32 · answer #3 · answered by madjer21755 5 · 0⤊ 0⤋
yes you are able to solve for x. you just have to do it yourself.
2006-10-03 17:39:14 · answer #4 · answered by terri b 1 · 0⤊ 0⤋
16498461684984194984
54654
6546549849841
498496841541684
654649494
6846846+
= do your own work.
2006-10-03 17:14:00 · answer #5 · answered by yomama h 2 · 0⤊ 0⤋