Question

(2x+4).(x-4) Calule

Answer 1

2*4=8 + 4= 12 é o resutado

Answer 2

(2x + 4) . (x - 4)
2x^2 - 8x + 4x - 16
2x^2 - 4x - 16
a = 2 b = -4 c = -16

formula delta
D = b^2 - 4 a c
D = (-4)^2 - 4 (2) (-16)
D = 16 - 8(-16)
D = 16 + 128
D = 144

formula de braskara
x = - b + , - \/D
......_________
...............2a

x = -(-4) + , - \/144
.......___________
..................2(2)

x = 4 + , - 12
......_______
............4

x1 = 4 + 12
......._____
.............4

x1 = 16
.......___
..........4

x1 = 4


x2 = 4 - 12
.........____
.............4

x2 = - 8
.........____
.............4

x2 = - 2