Question

X ao quadrado mais 3x menos 6 igual a -8

Answer 1

x² +3x -6 = -8
x² +3x -6 +8 = 0
x² +3x +2 = 0
a= 1 b= 3 c= 2

Δ= b² -4ac
Δ= (3)² -4·(1)·(2)
Δ= 9 - 8
Δ= 1

x = -b +-√Δ / 2a
x= -3 +-1/2

x'= -3 +1/2
x'= -2/2
x'= -1

x''= -3-1/2
x''= -4/2
x''= -2

S: {-2,-1}