Question

determine as raizes das equaçao

Answer 1

b) x^2-9x+18=0
delta=b^2-4ac
delta=(-9)^2-4.1.18
delta=81-72
delta=9
x=-b-/+ raiz de delta/2a
x=-(-9)-3/2.1
x=9-3/2
x=6/2
x=3
x=-(-9)+3/2.1
x=9+3/2
x=12/2
x=6
c) x^2+5x+4=0
delta=b^2-4ac
delta=5^2-4.1.4
delta=25-16
delta=9
x=-b-/+ raiz de delta/2a
x=-5-3/2.1
x=-8/2
x=-4
x=-5+3/2.1
x=-2/2
x=-1