Question

СРОЧНО ! Решите через дискриминант !
(17-x)² + x² = (15-x+x-2)²

Answer 1

$289 - 34x + x {}^{2} + x {}^{2} = 169 \\ 2x {}^{2} - 34x + 120 = 0 \\ x {}^{2} - 17x + 60 = 0 \\ d = 289 - 240 = {7}^{2} \\ x = \frac{17 + 7}{2} = 12 \\ x = \frac{17 - 7}{2} = 5$