Question

Solve t=-ln(0.2*t)

Answer 1

http://en.wikipedia.org/wiki/Lambert_W_function#Applications see example 1

Answer 2

(there is no closed-form solution in terms of elementary functions)

Answer 3

Sorry,I don't get it

Answer 4

Have you studied calculus yet?

Answer 5

t=W(5)=1.32672

Answer 6

Nope

Answer 7

if you're allowed to use a calculator, one way to solve this is to plot the two function & find the intersection. to find an exact solution, you need to use some calculus

Answer 8

*a graphing calculator

Answer 9

I can assume that t>0. Does it help?

Answer 10

the answer is t=1.32672 (approximately)
to get this answer, you either need to use a graphing calculator or use calculus