Question

x ao quadrado+2x-8=0

Answer 1

x²+2x-8=0
1º Passo= a= 1; b=2; c= -8
 2º Passo Formula- Delta
Δ=b²-4.a.c
Δ= (2)²-4.(1).(-8)
Δ= 4+ 32
Δ=-38

3º Formula de Bhaskara
x= -b +/- √Δ / 2.a
x= -(2) +/- √36 / 2.1
x= -2 +/- 6/ 2
x'= -2+6/2= 4/2= 2
x''= -2-6/2=-8/2= -4

S:{2;-4} 

Answer 2

x² + 2x - 8 = 0

A= 1

B= 2

C= - 8

∆= b² - 4ac

∆= 2² - 4 • 1 • ( - 8)

∆= 4 + 32

∆= 36

X= - B ± √∆/2A

x= - 2 ± √36/2 • 1

x= - 2 ± 6/2

x'= - 2 + 6/2 = 4/2 = 2

x''= - 2 - 6/2 = - 8/2 = - 4

S= ( - 4 , 2)