Question

X ao quadrado +2x-8=0

Answer 1

x²+2x-8=0
Agora aplicamos a fórmula de Bhaskara:
x²+2x-8=0
a=1 b=2 c=-8
Δ=b²-4ac
Δ=(-2)²-4×1×(-8)
Δ=4+32
Δ=36
(-b$\pm$√Δ)/2a
(-2$\pm$√36)2
(-2$\pm$6)/2
x'= (-2+6)/2= 4/2= 2
x"=(-2-6)/2= -8/2= -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)