Question

Act. #2 Operaciones inversas

{X2-9 = 0
X² - 5 = 20
X² = 64
5X2=125
X² - 10 =90​

Answer 1

x² - 9 = 0

(x+3)(x-3) = 0

x+ 3 = 0      x - 3 = 0

x = -3         x = 3

CS =  (-3; 3)

x² - 5 = 20

x² - 5 - 20 = 0

x² - 25 = 0

(x+5)(x-5) = 0

x + 5 = 0      x - 5 = 0

x = -5         x = 5

CS =  (-5 ; 5)

x² = 64

x² - 64 = 0

(x+8)(x-8) = 0

x+ 8 = 0      x - 8 = 0

x = -8         x = 8

CS =  (-8 ; 8)

Eternamente axllxa