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a)
3x2 +4x -4 = 0
delta = 16 - 4*3*(-4) = 16 - 12 * (-4) = 16+48 =64
nastepnie delte pod pierwiastkiem
pod pierwiastkiem 64 = 8
i teraz miejsca zerowe:
x1 = -b-delta/2a
x1 = -4-8 /2*3 = -12 /6= -2
x2 = -4 +8 /6 = 4/6 = 2/3