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(3x-5)^2 = 9x^2-15x-15x+25
= 9x^2-30x+25
keliling: 4s
4.(3x-5) = 12x-20
luas = (3x-5)(3x-5) = 9x²-30x+25
keliling = 3x-5+3x-5+3x-5+3x-5 = 12x-20
atau cara singkat 4(3x-5) = 12x-20