find the exact solution 3^(x+5)=9^x?

2 ⤊

2007-09-11 07:07:40 · 3 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics

3 ^ ( x + 5 ) = 3 ^ ( 2 x )
x + 5 = 2 x
x = 5

2007-09-11 08:31:55 · answer #1 · answered by Como 7 · 2⤊ 0⤋

if you take log in base 3 as 9 =3^2
x+5=2x so x=5

2007-09-11 07:11:59 · answer #2 · answered by santmann2002 7 · 0⤊ 0⤋

3^(x+5)=9^x
or 3^(x+5)=(3^2)^x
or 3^(x+5)=3^2x
or x+5=2x
or x=5 ans

2007-09-11 07:13:34 · answer #3 · answered by MAHAANIM07 4 · 0⤊ 0⤋