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Verified answer
4x² + 5x - 8 = 0a = 4
b = 5
c = -8
α+β = -b/a = -5/4
αβ = c/a = -8/4
3α + 3β
= 3(α+β)
= 3(-5/4)
= -15/4
3α . 3β
= 9(αβ)
= 9(-8/4)
= -72/4
jadi pers. kuadrat yang baru adalah
4x² + 15x - 72 = 0