Question

помогите с 7 заданием​

Answer 1

Ответ:

${x}^{2} - 18x + 84 = {(x - 9)}^{2} + 3$

${(x - 9)}^{2} \geqslant 0$

$3 > 0$

${(x - 9)}^{2} + 3 > 0$