Respostas

2014-07-16T16:46:26-03:00
A-) x2-7x+12=0. Delta: 49-48 Delta: 1. X= 7+ - 1/2. X'= 4. X"=3. B-) 2x(4x-1)=21. 8x2 - 2x -21=0. Delta: 4+672. Delta:676. X= 2 + - 26/16. X'= 7/4. X"= 3/2.