Question

Equações de segundo grau ajudem por favor:: x2+12x-28=0 E x2+10x+21=0

Answer 1

x^2+12x-28=0
delta=b^2-4ac
delta=12^2-4.1.(-28)
delta=144+112
delta=256
x=-b-/+ raiz de delta/2a
x=-12-16/2.1
x=-28/2
x=-14
x=-12+16/2.1
x=4/2
x=2
x^2+10x+21=0
delta=b^2-4ac
delta=10^2-4.1.21
delta=100-84
delta=16
x=-b-/+ raiz de delta/2a
x=-10-4/2.1
x=-14/2
x=-7
x=-10+4/2.1
x=-6/2
x=-3