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=(-11) ± √(11²)-4(2)(-21) / 2(2)
=-11 ± √121-168/4
=-11 ±√-47 / 4
X₁ = -11+6,8 / 4 = -1,05
X₂ = -11-6,8 / 4 = -4,45
Dikoreksi lagi ya ,thx :)