Question

y=x²+6x+8=  qual o valor ?

Answer 1

$x^{2} +6x+8=0 \Delta= b^{2} -4.a.c= \Delta= 6^{2} -4.1.8= \Delta=36-32=4 x1= -6-+ \sqrt{4} /2=-6-2/2=-8/2=-4 x2=-6-+ \sqrt{4} /2=-6+2/2=-4/2=-2$

Answer 2

y = x² + 6x + 8
f(x) = x² + 6x + 8

Para x = -1:
y = (-1)² + 6.(-1) + 8 = 1 - 6 + 8 = 3
Para x = 0:
y =  0² + 6.0 + 8 = 8
Para x = 1:
y = 1² + 6.1 + 8  = 10