Solve this...?

0 ⤊

log x + log 20 = 2.

solve for x.

2007-06-19 09:43:44 · 3 answers · asked by Emad K. 2 in Science & Mathematics ➔ Mathematics

logx + log20 = 2

subtract log20 for both sides
logx = 2 - log20

change to exponent form
x = 10^(2 - log20)

x = 5

2007-06-19 09:48:05 · answer #1 · answered by 7 · 0⤊ 0⤋

Take log to mean log to base 10.
log x + log 20 = 2
log (20 x) = 2
20x = 10²
20x = 100
x = 5

2007-06-19 10:18:42 · answer #2 · answered by Como 7 · 0⤊ 0⤋

logx + log 20 = log 20 x
log 20 x = 2
20x = 10 ^ 2= 100
20 x = 100
x = 5

2007-06-19 09:50:24 · answer #3 · answered by timemccormick 3 · 0⤊ 0⤋