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In Problems 7–12 match each of the given differential equations with one or more of these solutions:

(a) \(y = 0\), (b) \(y = 2\), (c) \(y = 2x\), (d) \(y = 2{x^2}\)

\(y'' + 9y = 18\)

Short Answer

Expert verified

The solution is \({\rm{y = 2}}\).

Step by step solution

01

Check \(y = 0\) if is a solution.

Put\({\rm{y = 0}}\).

\(\begin{array}{c}(0)'' + 9(0) = 18\\0 = 18\\0 \ne 18\end{array}\)

Hence, it is not a solution.

02

Check \(y = 2\) if is a solution.

Put\({\rm{y = 2}}\).

\(\begin{array}{c}(2)'' + 9(2) = 18\\0 + 18 = 18\\18 = 18\end{array}\)

Hence, it is a solution.

03

Check \(y = 2x\) if is a solution.

Put\({\rm{y = 2x}}\).

\(\begin{array}{c}(2x)'' + 9(2x) = 18\\0 + 18x = 18\\18x \ne 18\end{array}\)

Hence, it is not a solution.

04

Check \(y = 2{x^2}\) if is a solution.

Put \({\rm{y = 2}}{{\rm{x}}^2}\).

\(\begin{array}{c}(2{x^2})'' + 9(2{x^2}) = 18\\(4x)' + 18{x^2} = 18\\4 + 18{x^2} \ne 18\end{array}\)

Hence, it is not a solution.

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