00:01
The given function f of x, y, z it is equal to x raised to power 9 y into z square plus 5 into yz.
00:10
So to find the first partial derivatives we need to the derivative with respect to each variable while treating the other variables as constant.
00:19
So first of all calculating the fx of x, y, z it will be nothing but the partial derivative that is del by del x of f of x, y, z.
00:31
So this will be equal to del by del x of f of x, y, z value is x raised to power 9 y into z square plus 5 into yz.
00:43
So taking its derivative with respect to x it is 9 x raised to 8 y into z square plus 5 into yz its derivative will be 0.
00:53
So the required value of fx of x, y, z it is nothing but equal to 9 x raised to power 8 y into z square.
01:05
So this is the first value of fx of x, y, z.
01:08
Now we will calculate the fy of x, y, z.
01:12
So for this we will write fy of x, y, z it is equal to del by del y of f of x, y, z.
01:22
Now we know that f of x, y, z is given us as x raised to power 9 y into z square plus 5 into yz.
01:33
So calculating this partial derivative with respect to y it will be x raised to 9 into z square plus 5 into z.
01:43
So this will be the required value for fy...