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4x²-4x+1 = 3x+5
4x²-4x-3x+1-5 = 0
4x²-7x-4 = 0
a = 1, b = -7, dan c = -4
D = b²-4ac
D = (-7)²-4.1.(-4)
= 49+16
= 65
Semoga membantu ya :)