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1/2 (d₁)(d₂) = 9x² +9x - 28
d₁ d₂ = 2(9x² +9x - 28)
d₁ d₂ = 2(3x +7)(3x -4)
d₁ d2 = (6x + 14) (3x - 4)
d₁ = 6x + 14
d₂ = 3x - 4