Respostas

2013-04-01T00:17:31-03:00

Δ=b^2-4.a.c

Δ=15^2-4.3.12

Δ=225-144

Δ-=81

 

x=-b+-\sqrt81

x=-(-15)+-0/2.a

 

x`=15+9/6

x´=4

 

x´´=15-9/6

x´´=1