00:01
In this problem, we have three parts.
00:03
In the first two parts, we are given two differential equations and we will show the degree and order of these differential equations.
00:14
And in the last part, we are given a solution, a y -function, and then we will form a differential equation that is satisfied by this solution.
00:25
Let us remember the following.
00:27
Order means highest derivative in a differential equation and degree means power of that highest derivative term.
00:47
With that, let us write down our differential equations.
00:50
And i will use the prime notation to indicate derivative with respect to x.
00:57
So we have y'' ' squared plus 7y' ' plus 8y ' to the power 4 minus 9y equal to ln x.
01:13
So this is the critical term here.
01:16
And we see that this differential equation is third order and second degree.
01:29
The second equation, we have 1 plus y' ' squared to the power 2 over 3 equal to 3y''.
01:43
And this is the key term here.
01:46
So we see that this is second order and first degree...