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9+15x+15x+25x^2
9+30x+25x^2
25x^2+30x+9
= 3(3 + 5x) + 5x(3 + 5x)
= 9 + 15x + 15x + 25x²
= 9 + 30x + 25x²
atau
= 25x² + 30x + 9