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x₁+x₂ = -b/a = -2/1 = -2
x₁.x₂ = c/a = -2/1 = -2
a) akar yg baru:
α = 3x₁ dan β = 3x₂
α+β = 3x₁+3x₂
= 3(x₁+x₂)
= 3(-2)
= -6
α.β = 3x₁.3x₂
= 9x₁.x₂
= 9(-2)
= -18
p.k. baru --> x² - (α+β)x + (α.β) = 0
x² - (-6)x + (-18) = 0
x² + 6x - 18 = 0
yg b) langkah sama, dicoba utk latihan ya dek..
semoga membantu.. :)