891. Решите уравнение: a) m² - 25 = 0; в) -- 9х2 – 4 = 0; 6) x² - 36 = 0; г) 16х2 – 49 = 0.

a) m² - 25 = 0

m² = 25

m = ±5

Ответ: m = 5, m = -5

б) x² - 36 = 0

x² = 36

x = ±6

Ответ: x = 6, x = -6

в) 9x² - 4 = 0

9x² = 4

x² = \(\frac{4}{9}\)

x = ±\(\frac{2}{3}\)

Ответ: x = \(\frac{2}{3}\), x = -\(\frac{2}{3}\)

г) 16x² - 49 = 0

16x² = 49

x² = \(\frac{49}{16}\)

x = ±\(\frac{7}{4}\)

Ответ: x = \(\frac{7}{4}\), x = -\(\frac{7}{4}\)