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= 4x³-x²+8x-1 - 4x³+2x²-10x+5
= -3x²+18x-6 kalikan -3
= x²-6x+2
rumus abc
X₁₂ = b² +_ √4ac dibagi 2a
= 36 +_ √8 dibagi2
= 36 +_ 2√2 dibagi 2
berarti
X₁ = 18 + √2
atau
X₂ = 18 - √2