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= 9x^2 - 15x -15x +25
= 9x^2 + 25
keliling = 4 x (3x - 5)
= 12x - 20
= 9x²- 15x -15x +25
= 9x² -30x + 25
kliling = 4 ( 3x - 5)
= 12x - 20