Posted by Hannah on Monday, November 1, 2010 at 4:16pm.
if f(x) = 2x  x ln x
show that f(e^3) = e^3
I know you have to substitute e^3 into the function, so Ive sone ths so far:
2e^3  e^3 ln e^3
What is the next step?

Maths  bobpursley, Monday, November 1, 2010 at 4:31pm
2e^3e^3lne^3=
2e^3e^3*3=e^3
34= ln (e^34)