Question

f(x)= -x^2+2x+1 ,determine X tal que f(x) <0

Answer 1

x^2+2x+1=0
a=1
b=2
c=0
Delta=b^2-4.a.c
Delta=2^2-4.1.0
Delta=4-0
Delta=4
x=-b+-raiz de delta/2.a
x1=-2+2/2.1=0/3=0
x2=-2-2/2.1=-4/3