Question

Решите пожалуйста!!!!!! ​

Answer 1

$frac{14}{x {}^{2} - 2x } - frac{21}{x {}^{2} + 2x} - frac{5}{x} = 0$

$frac{14(x + 2) - 21(x - 2) - 5(x - 2)(x + 2)}{x(x - 2)(x + 2)} = 0$

$frac{14x + 28 - 21x + 42 - 5x {}^{2} + 20}{x(x - 2)(x + 2)} = 0$

$frac{ - 7x + 90 - 5x {}^{2} }{x(x - 2)(x + 2)} = 0$

$7x + 90 - 5x {}^{2} = 0$

$5x {}^{2} + 7x = 0$

$x1 = - 5 \ x2 = 3.6$