Question

conjunto solução das equações: a) x²-x-6=0 b) 5x²+6x+1=0

Answer 1

a) x^2-x-6=0
delta=b^2-4ac
delta=(-1)^2-4.1.(-6)
delta=1+24
delta=25
x=-b-/+ raiz de delta/2a
x=-(-1)-5/2.1
x=1-5/2
x=-4/2
x=-2
x=-(-1)+5/2.1
x=1+5/2
x=6/2
x=3
S={-2, 3}
b) 5x^2+6x+1=0
delta=b^2-4ac
delta=6^2-4.5.1
delta=36-20
delta=16
x=-b-/+ raiz de delta/2a
x=-6-4/2.5
x=-10/10
x=-1
x=-6+4/2.5
x=-2/10
x=-0,2
S={-1, -0,2}