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Bagian b.
= x^2 + 8x +15 / x+5
= (x + 3 )(x + 5) / x + 5
= x + 3
b. (x^2 + 8x +15) + (1 / x+5)
= (x^2 + 8x +15)(x + 5) + 1 per x + 5
= x^3 + 5x^2 + 8x^2 + 40x + 15x + 75 + 1 per x + 5
= x^3 + 13x^2 + 55x + 76 per x + 5