Question

Решите неравенство

$x^{2} - 20 x \geq - 11 x - 7 - x^{2}$

Answer 1

2x²-9x+7≥0

2x²-2x-7x+7≥0

2x(x-1)-7(x-1)≥0

(x-1)(2x-7)≥0

x∈(-∞;1]∪[3,5;+∞)