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= 324y^2-540y+225
jadi
a+b+c = 324-540+225=9
Yeyyy!!!!!
324y² - 270y -270y + 225
324 = a
-270-270 = -540 = b
225 = c
a+b+c = 324 +(-540) + 225
= -216 + 225
= 9