The expression of higher one function If f (x) = 8x + 1, G (x) = x square, then f [g (x)] =?, G [f (x)] =?

F [g (x)] = 8x square + 1, G [f (x)] = (8x + 1) square, so the result is 64x square + 16x + 1
I don't know how to make it square

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