Question

X elevado ao quadrado menos 8x + 12 = 0

Answer 1

x² - 8x + 12

a = 1 / b = -8 / c = 12

Δ = b² - 4ac
Δ = (-8)² - 4(1)(12)
Δ = 64 - 48
Δ = 16

x = (-b ± √Δ)/2a

x' = [-(-8) + √16]/2
x' = [8 + 4]/2
x' = 12/2
x' = 6

x'' = [-(-8) - √16]/2
x'' = [8 - 4]/2
x'' = 4/2
x'' = 2

S = {x'; x''}
S = {6; 2)

Answer 2

sabendo - se que  :
Δ = b² - 4ac
Δ = (-8)² - 4(1)(12)
Δ = 64 - 48
Δ = 16

x = (-b ± √Δ)/2a

x' = [-(-8) + √16]/2
x' = [8 + 4]/2
x' = 12/2
x' = 6

x'' = [-(-8) - √16]/2
x'' = [8 - 4]/2
x'' = 4/2
x'' = 2

S = {x'; x''}
S = {6; 2)