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Correct Answer :

9

Solution :

The correct answer is 9.

Based on the image provided, we are given the following second-order linear ordinary differential equation:
x 2 d 2 y d x 2 + x d y d x - y = 0 , x 1
with the initial conditions:
y ( x = 1 ) = 6 , d y d x | x = 1 = 2

This is a homogeneous Cauchy-Euler differential equation. To find the general solution, we assume a solution of the form y=xr. Substituting y and its derivatives into the differential equation yields the auxiliary (characteristic) equation:
r ( r - 1 ) + r - 1 = 0

Simplifying the characteristic equation:
r 2 - r + r - 1 = 0
r 2 - 1 = 0
Thus, the roots of the equation are:
r = 1 and r = - 11

The general solution is a linear combination of the two independent solutions:
y ( x ) = C 1 x + C 2 x

Now, we differentiate the general solution to apply the derivative initial condition:
d y d x = C 1 - C 2 x 22

Applying the first initial condition y(1)=6:
C 1 ( 1 ) + C 2 1 = 6 C 1 + C 2 = 6 (Equation 1)

Applying the second initial condition dydx|x=1=2:
C 1 - C 2 1 2 = 22 C 1 - C 2 = 2 (Equation 2)

Adding Equation 1 and Equation 2:
( C 1 + C 2 ) + ( C 1 - C 2 ) = 66 + 2
2 C 1 = 8 C 1 = 4

Substituting C1=4 back into Equation 1:
4 + C 2 = 6 C 2 = 2

So, the particular solution to the differential equation is:
y ( x ) = 4 x + 2 x

Finally, we calculate the value of y at x=2:
y ( 2 ) = 4 ( 2 ) + 2 2
y ( 2 ) = 8 + 1 = 9

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