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3x^2 - 5x = 0
D = 25 - 4*3*0 = 25
x1 = (5-5)/2*3 = 0/6 = 0
x2 = (5+5)/6 = 10/6 = 5/3 = 1 2/3
b)
-2x^2-3x = 0
D = 9+4*(-2)*0 = 9
x1 = (3-3)/(-2)*2 = 0/-4 = 0
x2 = (3+3)/-4 = -6/4 = -1 1/2