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= 2(x² + 2x + 1) + 3
= 2x² + 4x + 5
(f o g)(x) = f(2x + 3)
= (2x + 3)² + 2(2x + 3) + 1
= 4x² + 12x + 9 + 4x + 6 + 1
= 4x² + 16x + 16