12x^2 - 8 - 15 = 012x^2 - 23 = 012x^2 = 23x^2 = 23/12x = ±√(23/12)x = ±√(46/24)x = ±√46 / √24x = ±√46 / 2√6x = ±√46 / 2√6 √6/√6x = ±√276 / 12x = ±√(4 69) / 12x = ±2√69 / 12x = ±√69 / 6
Ответ: x = ±√69 / 6
12x^2 - 8 - 15 = 0
12x^2 - 23 = 0
12x^2 = 23
x^2 = 23/12
x = ±√(23/12)
x = ±√(46/24)
x = ±√46 / √24
x = ±√46 / 2√6
x = ±√46 / 2√6 √6/√6
x = ±√276 / 12
x = ±√(4 69) / 12
x = ±2√69 / 12
x = ±√69 / 6
Ответ: x = ±√69 / 6