2006-12-12 14:12:43 · 4 answers · asked by Jr C 1 in Science & Mathematics ➔ Mathematics
I am rusty on ln but for the second one....
Change it to power form: x^2 + 19 = 10^2
This gives x^2 = 100 - 19
x^2 = 81
x = 9 or -9
Not sure if this is right but...
For the first one...I know ln is just log to base e...
This becomes e = 3x
e/3 = x
2006-12-12 14:30:42 · answer #1 · answered by keely_66 3 · 0⤊ 0⤋
12 – x = -7 12-X+7=-7+7 19-X=0 X=19
2016-05-23 16:39:45 · answer #2 · answered by Beth 4 · 0⤊ 0⤋
For the first one, you want to take the inverse of the natural log which is e^x. So,
e^1=3x or e=3x
therefore, x=e/3 or about .9060939428
you can always check your answer by plugging it back into the original equation.
2006-12-12 15:01:38 · answer #3 · answered by math help 1 · 0⤊ 0⤋
ln(3x) = 1
3x = e^1
3x = e
x = (e/3)
------------------------------
log(x^2 + 19) = 2
x^2 + 19 = 10^2
x^2 + 19 = 100
x^2 = 81
x = -9 or 9
2006-12-12 15:24:57 · answer #4 · answered by Sherman81 6 · 0⤊ 0⤋