00:02
Okay, let's figure out if any of these x values are solutions to the equation.
00:07
So starting with part a, we have 4 times e raised to the 1 plus natural log 15 minus 1.
00:15
We're going to see if that equals 60.
00:17
And we can add the 1 in the negative 1 in the exponent.
00:20
Those cancel each other.
00:22
So now we have 4e to the natural log 15.
00:26
And e to the natural log 15, because we have inverse functions there, canceling each other, is just equal to 15.
00:33
So we have 4 times 15, and yes, that does equal 60.
00:37
So that number is a solution.
00:40
Now let's move on to part b...