19. Решить уравнение: 9x² + 16x − 1 = 0.

Question

D = 16² − 4·9·(−1) = 292 = 4·73.

x = (−16 ± 2√73)/18 = (−8 ± √73)/9.

Ответ: x = (−8 ± √73)/9.

Accepted Answer

D = 16² − 4·9·(−1) = 292 = 4·73.

x = (−16 ± 2√73)/18 = (−8 ± √73)/9.

Ответ: x = (−8 ± √73)/9.