Question

решите уравнение x^2-3|x|-4=0 помогите, срочнооо. ​

Answer 1

Ответ:

$x {}^{2} - 3 |x| - 4 = 0 \\ x {}^{2} - 3x - 4 = 0. \geqslant 0 \\ x {}^{2} - 3 \times ( - x) - 4 = 0.x < 0 \\ x = - 1.x \geqslant 0 \\ x = 4 \\ x = - 4. < 0 \\ x = 1 \\ x = 4 \\ x = - 4 \\ x {}^{1} = - 4.x {}^{2} = 4$