Norm of the linear functional $I(x)=\int_{-2}^3 t^2x(t)dt.$

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My task is to find Norm of the linear functional

$I(x)=\int_{-2}^3 t^2x(t)dt$
$C[-2,3]$

So this is my solution But I don't understand what should I do further. What should I do next?