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( f o g )(x) = f(g(x))
= f (x + 2)
= 2 (x + 2)² - 3 (x + 2) + 4
= 2 (x² + 4x + 4) - (3x + 6) + 4
= 2x² + 8x + 8 - 3x - 6 + 4
= 2x² + 5x + 6