2log4x=5log4(7)?

1 ⤊

solve the equation
the 4's are little and a bit below. sry i dont kno how to say it.

2007-11-18 10:37:23 · 4 answers · asked by dave h 1 in Science & Mathematics ➔ Mathematics

log is understood to be to base 4 in the following:-
2 log x = 5 log 7
log x² = log 7^5
x² = 7^5
x = 7^(5/2)

2007-11-22 06:13:53 · answer #1 · answered by Como 7 · 1⤊ 1⤋

log(4) xÂ²= log(4) 7^5
xÂ²= 7^5
x = 7^5/2 = 49â7

2007-11-18 18:41:55 · answer #2 · answered by chasrmck 6 · 0⤊ 0⤋

log(x^2) = log(7^5)
x^2 = 7^5
x = sqrt(7^5)
x â 129.64

2007-11-18 18:42:53 · answer #3 · answered by gudspeling 7 · 0⤊ 0⤋

log_4(x^2) = log_4(7^5)
x^2=7^5=16807
x = 129.64

2007-11-18 18:44:31 · answer #4 · answered by norman 7 · 0⤊ 0⤋