Respuestas
x² - 4 = 0 diferencia de cuadrados
x² - 2² = 0
(x+2)(x-2) = 0
x + 2 = 0 x - 2 = 0
x = -2 x = 2
CS = (-2; 2)
(x - 5)² = 144
(x - 5)² - 144 = 0
(x - 5)² - 12² = 0 diferencia de cuadrados
(x - 5 + 12)(x - 5 -12)
(x + 7)(x - 7) = 0
x + 7 = 0 x -7 = 0
x = - 7 x = 7
CS = (-7; 7)
2x² - 8 = 0
2(x²-4) = 0
x² - 4 = 0/2
x² - 4 = 0 diferencia de cuadrados
(x+2)(x - 2) = 0
x + 2 = 0 x - 2 = 0
x = -2 x = 2
CS = ( -2; 2)
x² + 2x = 35
x² + 2x - 35 = 0
x + 7
x - 5
7x - 5x = 2x
(x + 7)(x - 5) = 0
x + 7 = 0 x - 5 = 0
x = - 7 x = 5
CS = (-7, 5)
5x² = 45
5x² - 45 = 0
5(x²-9) = 0
x² - 9 = 0/2
x² - 9 = 0
(x+3)(x-3) = 0
x + 3 = 0 x - 3 = 0
x = -3 x = 3
CS = (-3; 3)
Eternamente axllxa