Question

Equação do Segundo Grau
4+x(x-4)=x

Answer 1

4+x(x-4)=x
4+x²-4x-x=0
x² -5x + 4 = 0

Δ=25-4(1)(4) = 25 - 16 = 9

x1 = (5 + 3)/2 = 4

x2 = (5 - 3)/2 = 1

Espero ter ajudado

Answer 2

4+x(x-4)=x

4 + x² - 4x = x

x² - 4x - x + 4 = 0

x² - 5x + 4 = 0

A= 1

B= - 5

C= 4

∆= b² - 4ac

∆= ( - 5)² - 4 • 1 • 4

∆= 25 - 16

∆= 9

x= - b ± √∆ /2a

x= - ( - 5) ± √9 /2 • 1

x= 5 ± 3/2

x'= 5 + 3/2 = 8/2 = 4

x''= 5 - 3/2 = 2/2 = 1

S= ( 1 , 4)