21 (a) ²x¹ d(x³). Note a(x) = x³. 3 (b) (²x² d(ex). Note a(x) = ex 2

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A: To solve the given domain problem of the functions.

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A: NOTE: Refresh your page if you can't see any equations. .

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A: Please see the below picture for detailed solution.

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A: The characteristic equation is            m2-m+14=0⇒4m2-4m+1=0⇒m=--4±02· 4⇒m=12,12 Now, the general…