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x - 2 = y
x = y + 2
masukan x = y + 2 dengan mengganti y dengan x
h(x) = (x + 2)² + 4(x + 2) + 1
h(x) = x² + 4x + 4 + 4x + 8 + 1
h(x) = x² + 8x + 13