(14+х)(14-х);(5a+3b)(3b-5a);(2n²+n)(n-2n²)

а) (14 + x)(14 - x) = 196 - x² б) (5a + 3b)(3b - 5a) = 9b² - 25a² в) (2n² + n)(n - 2n²) = 4n⁴ - n² а) x² - 121 = (x - 11)(x + 11) б) -0,04a² + b²c² = (bc - 0,2a)(bc + 0,2a) в) (x - 1)² - 9 = (x - 1)² - 3² = (x - 1 - 3)(x - 1 + 3) = (x - 4)(x + 2) x² - (x - 4)(x + 4) = 2x x² - x² + 16 = 2x 16 = 2x x = 8 25x² - 16 = 0 (5x - 4)(5x + 4) = 0 5x - 4 = 0 и 5x + 4 = 0 x = 0,8 и x = -0,8