Question

4x2-8x-4=0
x2-6x+8=0
Por favor

Answer 1

4 x 2 - 8x - 4 = 0

- 8x = -4 x -2 - 4 + 0

- 8x = - 8 - 4 + 0

- 8x = - 12  ₍ -1 ₎

8 x = 12

x = 12 / 8

x= 6/4

x= 3/2 ou 1,5

2x - 6x + 8 = 0

2x - 6x = -8

- 4x = - 8 ₍ - 1 ₎

4x = 8

x = 8 / 4

x = 2

Answer 2

A) 4x² - 8x - 4 = 0

A= 4
B= - 8
C= - 4

∆= b² - 4ac

∆= (-8)² - 4 . 4 . (-4)
∆= 64 + 64
∆= 128

x= - b ± √∆ / 2a

x= - (-8) ± √128 / 2 . 4
x= 8 ± √128 / 8

x' = 8 + √128 / 8
x''= 8 - √128 / 8

S={ 8 + √128/ 8 , 8 - √128 / 8}

B)x² - 6x + 8 = 0

A= 1
B= - 6
C= 8

∆= b² - 4ac

∆= (-6)² - 4 . 1 . 8
∆= 36 - 32
∆= 4

x= - b ± √∆ / 2a

x= - (-6) ± √4 / 2 . 1
x= 6 ± 2 / 2

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

S={ 4 , 2}