Question

Решите срочно))))))))))))))

Answer 1

$D/4 = 25 - 18 = 7$

 

$x_1 = 5 + sqrt7$

 

$x_2 = 5 - sqrt7$

Answer 2

x² - 10x +18 = 0;

Д = 100 - 4*18 = 100 -72 = 28 = 2√7;

х₁ = (10 - 2√7)/2 = 5 - √7;

х₂ = (10 + 2√7)/2 = 5 + √7.

ОТВЕТ:  5 - √7; 5 + √7.