Question

Os zeros da função f(x)= -x²+4x+5 ???

Answer 1

f(x)=-x²+4x+5  a=-1 b=4 c=5
delta=4²-4.(-1).5
=16+20
=36

x=-4+-raiz de 36/2.(-1)

x1=-4+6/-2 = 2/-2=1

x2=-4-6/-2=-10/-2=5