Question

Dada a Função f:R-R, definida por f (x)=x2+6x+9, calcule: A)f (-4) B)f (x)=36

Answer 1

a)f(x)=x2+6x+9
f(-4)= 4^2+6.4+9
f(-4)= 16+36+9
f(-4)= 61

b)f(x)=x2+6x+9
36=x2+6x+9
x2+6x+9-36=0
x2+6x-27=0
a=1
b=6
c=-27
∆=6^2-4.1.(-27)
∆=144
x'=-6+12/2=3
x''=-6-12/2=-9