Question

Determine as raízes e as coordenadas da função definida pela equação y=x-2x -8

Answer 1

y = x² -2x -8
∆= (-2)² -4.1.(-8)= 4+32= 36 ==>√∆=6
x' = 2+6/2 = 4 ✓
x" =2-6/2 = -2 ✓

xv = -b/2a = 2/2 = 2
yv = -∆/4a = -36/4 = -9