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- a) 3x2+18x-21=0
- a=3 b=18 c=-21
- d= 182 -4*3*-21
- d= 576
- x=(-18+√576)/(2*3) x= 1
- x=(-18-√576)/(2*3) x= -7
- b) 6x2 + x - 1 = 0
- a= 6 b= 1 c= -1
- d= 12-4*6*-1
- d= 24
- x=(-1+√24)/(2*6) x= 0,325
- x=(-1-√24)/(2*6) x= -0,492
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