Respostas

2013-08-14T15:42:18-03:00
1) (-8)²-4*12*1 = 64-48 = 16; x = (-(-8) +/- raiz de 16)/2.12 ; x =( 8 +/- 4)/24; x = 12/24 = 1/2 e 4/24 = 1/6

2) 2²-4*3*(-8) = 4+96 = 100; x= (-2 +/- raiz de 100)/2*3; x = (-2 +/- 10)6; x = 8/6 = 4/3 e -12/6 = -2

3) (-1)² -4*(-6)*1 = 1+24 = 25; x=(-(-1) +/- raiz de 25)/2*(-6); x = (1 +/- 5)/-12 ; x= 6/-12 = -1/2 e 4/-12 = -1/3
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