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g = x + 1
f o g = 8(x+1)² + 2(x+1) + 1
f o g = 8(x²+2x+2) + 2x + 2 + 1
f o g = 8x² + 16x + 16 + 2x + 2 + 1
f o g = 8x² + 18x + 18 + 1