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karena x² + 11x + 20 = (x+3)² + 5(x+3) - 4, maka f(x+3)=(x+3)² + 5(x+3) - 4
jadi, f(x+1) = (x+1)² + 5(x+1) - 4
=x² +2x +1 +5x +5 -4
=x² + 7x +2