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= x2-(a+b+6)x + (ab+3a+3b+9)
= x2-(-b/a+6)x + (c/a+3(-b/a)+9)
= x2-(3+6)x + (1/2+3(3)+9)
= x2-9x+37/2
dikali 2
= 2x2-18x+37