Calcule as raízes usando a fórmula de Bháskara:

A) 4x² -7x +3=0

B)x(x-1)=11x -36

C)-x² -2x+15=0

D)3y² -4y +2=0

E)5m² - 13m +6=0

F)7x² +28x +21=0

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