1. x² + 6x - 16 = 0
x² + 6x = 16
x² + 6x + (3)² = 16 + (3)²
x² + 6x + 9 = 16 + 9
x² + 6x + 9 = 25 (x + 3)² = 25 x + 3 = √25
( Sabemos que : √25 = 5 ó - 5 ) x + 3 = 5 x + 3 = - 5 x = 5 - 3 x = - 5 - 3 x = 2 x = - 8
.
: x1 = 2 ^ x2 = - 8
2.
X² - 8x - 20 = 0
x² - 8x = 20
x² - 8x + (4)² = 20 + (4)²
x² - 8x + 16 = 20 + 16
x² - 8x + 16 = 36 (x - 4)² = 36 x - 4 = √36
(Sabemos que√36 = 6 ó - 6) x - 4 = 6 x - 4 = - 6 x = 6 + 4 x = - 6 + 4 x = 10 x = - 2
.
: x1 = 10 ^ x2 = - 2
3.
X² + 10x + 24 = 0
x² + 10x = - 24
x² + 10x + (5)² = - 24 + (5)²
x² + 10x + 25 = - 24 + 25
x² + 10x + 25 = 1 (x + 5)² = 1 x + 5 = √1
(Sabemos que√1 = 1 ó - 1) x + 5 = 1 x + 5 = - 1 x = 1 - 5 x = - 1 - 5 x = - 4 x = - 6
.
: x1 = - 4 ^ x2 = - 6 * Espero haberte ayudado, saludos.