math trig
posted by greeny on .
ln(2x5)= 4
how do i this problem? thanks!

ln(2x5) = 4
we raise both sides by e:
e^(ln(2x5)) = e^4
the e and ln will be cancelled, leaving only the 2x  5:
2x  5 = e^4
2x = e^4 + 5
x = (e^4 + 5)/2
hope this helps~ :)