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I'm learning about Laplace and I was wondering what substitution is when using laplace.

Just say you have to find the laplace transform of

{x^4 e^4x}

I know what the individual transforms are = 4!//S^5 and 1/S-3

but how do you kinda smush them together, apparently thats substitution but I would like to know what it is? and how it's done?

Any help would be really appreciated!

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# Substitution in Laplace

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