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Δ = b² - 4ac = 6² -(-26*9*4)= 36 -(-936)= 36+936= 972
x1 = (-b-√Δ)/2a = (-6-√972)/2*9= (-6-√972) / 18
x2= (-b+√972) / 2a= (-6+√972) / 18
4x² - 12x - 11 = 0
Δ= b² -4ac = (-12)² - (-11*4*4)= 144 - (-176)= 144+176= 320
x1= (-b-√Δ)/2a = (12-√320)/2*4= (12 - √320) / 8
x2 = (-b+√Δ)/2a = (12+√320)/2*4= (12+√320) / 8