Question

Resposta da função quadrática f(x)= x2 + x - 6

Answer 1

a=1; b=1; c=-6
∆=b²-4ac→ ∆=1²-4.1.(-6)⇒ ∆=1+24⇒ ∆=25
x=-b±√∆ / 2.a→ x=-1± √25 / 2.1→ x=-1±5 / 2
x'=-1+5/2⇒ x'=4/2⇒ x'=2
x''=-1-5/2⇒ x''=-6/2⇒ x''=-3
S={-3 , 2}