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-9x² + 25 =0
Δ = 0² - (-9*25*4)= 900
√Δ = 30
x1 = (-b-√Δ) / 2a = (0-30)/2*(-9)= -30/(-18) = 5/3
x2 = (-b+√Δ) / 2a = (0+30) / 2*(-9)= 30/ (-18) = -5/3