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m+n = -b/a = 4/2 = 2
m.n = c/a = 1/2
akar yg baru
α = m+n = 2
β = m.n = 1/2
α+β = 2 + 1/2 = 5/2
α.β = 2.1/2 = 1
pers kuadrat baru
x² - (α+β)x + (α.β) = 0
x² - 5/2x + 1 = 0 --> kedua ruas dikali 2
2x² - 5x + 2 = 0
semoga membantu ya :)