Matematica

X2 -2x – 1= 2……………………………………….. comprobación # 1
X2 – 2x – 1 – 2 = 2 – 2
X2 – 2 x – 3 = 0……………………………………..comprobación # 2
(x -3 ) ( x + 1 ) = 0……………………………….. comprobación # 3
X – 3 = 0
X – 3 + 3 = 0 + 3
X1 = 3
X + 1 = 0
X2 = - 1
Resultado de 1ra Comprobación
X2 – 2 x – 1 = 2
32 – 2 ( 3 ) – 1 = 2
9 – 6 -1 = 2
9 – 7 = 22 = 2
Resultado de 2da comprobación
X 2 – 2x -3 = 0
3 2 – 2 ( 3 ) – 3 = 0
9 – 6 - 3 = 0
0 = 0
X2 – 2 x – 3 = 0
(- 1 ) 2 -2 ( - 1 ) – 3 = 01 + 2 – 3 = 0
0 = 0

X2– 2x – 1 = 2………………………………………….. comprobación de la 1ra comprobación
( - 1 )2 – 2 ( - 1 ) – 1 = 2
X + 2 – x = 2
2 = 2

( x– 3 ) ( x + 1 ) = 0 ………………………………….comprobación # 3
( 3 – 3 ) ( 3 + 1 ) = 0
0 ( 9 + 3 – 9 – 3 ) = 0
0 = 0


( x – 3 ) ( x + 1 ) = 0…………………………………..Resultado de la comprobación # 3
( - 1 – 3 ) ( - 1 + 1 ) = 0
( + 1 - 1 + 3 – 3 ) = 0
0 = 0X2 + 6x – 27 = 0 x2 = a; + 6x = bx; -27 = c ……………. Formula cuadrática
X2 + 6x = 27
X2 + 6x + (6/2 )2 = 27 + ( 6/2 )2
X2 + 6x + 9 = 27 + 9
X2 + 6x + 9 = 36
( x + 3 )2 = 36
X + 3 +/- r 36= +/- 6
X = - 3 +/- 6
X = - 3 + 6
X = 3 ……………………………… 1er resultado de la raíz cuadrada
X = - 3 – 6
X = - 9 …………………………… 2do resultado de la raízcuadrada
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Comprobación

X2 + 6x – 27 = 0
( 3 )2 + 6 ( 3 ) – 27 = 0
9 + 18 – 27 =0
27 – 27 = 0
0 = 0
Comprobación

X2 + 6x – 27 = 0
( - 9 )2 + 6 ( - 9 ) – 27 = 0
81 – 54 – 27 = 0
81 – 81 = 0
0 = 0