Question

qual valor de: (2x + 8) · (4x + 1) ?
Explique Pls

Answer 1

(2x + 8 ) . ( 4x + 1 )
=> (2x)(4x) +(2x)(1) + (8)(4x) + (8)(1)
=> 8x^2 + 2x + 32x + 8
=> 8x^2 + 34x + 8
=> a = 8...b = 34....c = 8
Formula delta
D = b^2 - 4 a c
D = ( 34 )^2 - 4 (8) (8)
D = 1.156 - 32 (8)
D = 1.156 - 256
D = 900

Formula de braskara :
X = - b + , - \/D
......._________
................2a

X = - 34 + , - \/900
.......____________
...............2(8)

X = - 34 + , - 30
........_________
..................16

X1 = - 34 + 30
.........________
.................16

X1 = - 4
............__.....(÷4)
.............16

X1 = - 1
.........____
.............4

---------------------------->>>>>

X2 = - 34 - 30
..........._______
...................16

X2 = - 64
.........._____
..............16

X2 = - 4