A suitable approximate solution for the boundary value problem d'u 4 du +9u =6 dr2 with appropriate boundary conditions is u(x) = x-1 + a*(x²+2*x+5) Find the residual of this approximate solution. Your answer should only consist of a single expression that represents the residual (not an equation) in terms of the variables a and Your answer should be expressed in terms of the variables a and x using the correct syntax. For example: 13*x-41+a*(3*x^2+55*x+81) residual = Skipped

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A:

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A: Reprieve is to clarify the doubts.

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A:

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