Question

. Решите уравнение 5x? +8 |x| +3 = (0)​

Answer 1

Объяснение:

${5x}^{2} + 8 |x| + 3 = 0 \\ {x}^{2} = { |x| }^{2} \\ {5x}^{2} + 8x = - 3 \\ {5x}^{2} + 8x = 3$

$d1= 64 - 4 \times 5 \times - 3 = 124 > 0 \\ x1 = \frac{ - 8 + \sqrt{124} }{10} \\ x2 = \frac{ - 8 - \sqrt{124} }{10}$

$d2 = 64 - 4 \times 5 \times 3 = 4 > 0 \\ x1 = \frac{ - 8 + \sqrt{4} }{10} = \frac{ - 6}{10} = - 0.6 \\ x2 = \frac{ - 8 - \sqrt{4} }{10} = \frac{ - 10}{10} = - 1$