Question

Найди корни уравнения.

Answer 1

$3x^{4} - 108x^{2} = 0\\3x^{2} (x^{2} - 36) = 0\\3x^{2} (x - 6)(x + 6) = 0\\a^{2} - b^{2} = (a - b)(a + b)\\x = -6.......x = 0......... x = 6$