Question

segundo grau X elevado a 2 menos 3X menos 28igual a 0

Answer 1

x^2-3x-28=0
delta=b^2-4ac
delta=(-3)^2-4.1.(-28)
delta=9+112
delta=121
x=-b-/+ raiz de delta/2a
x=-(-3)-11/2.1
x=3-11/2
x=-8/2
x=-4
x=-(-3)+11/2.1
x=3+11/2
x=14/2
x=7