Question

Dada a função f(x)= -X²+5X +6, calcule.
a)f(- 1) =
b)f( x ) = 0

Answer 1

f(x)=-x^2+5x+6
a) f(-1)=(-1)^2+5.(-1)+6
f(-1)=1-5+6
f(-1)=-4+6
f(-1)=2
b) f(x)=0
-x^2+5x+6=0
delta=b^2-4ac
delta=5^2-4.(-1).6
delta=25+24
delta=49
x=-b-/+ raiz de delta/2a
x=-5-7/2.(-1)
x=-12/-2
x=6
x=-5+7/2.(-1)
x=2/-2
x=-1