Question

Resolva a equação (x-4). (2x+12)>()

Answer 1

(x - 4) (2x + 12) > 0

2x^2 - 12x - 8x + 48 > 0

2x^2 - 20x + 48 > 0

a=2. b=- 20. c= 48

formula de delta

D = b^2 - 4 a c

D = (-20)^2 - 4 (2)(48)

D = 400 - 8 (48)

D = 400 - 384

D = 16

formula de braskara

X = - b - , + \/D
......._________
................2 a

X = - (-20) - , + \/16
........___________
...................2(2)

X = 20 - , + 4
......._______
...............4

X' = 20 - 4
......._____
............4

x' = 16
.......__
........4

X' = 4


X" = 20 + 4
........______
.............4

X" = 24
........___
..........4

X" = 6

S = { 4 , 6 }