Реши уравнение x2 + 30x – 5 = 0. 〇 x1 = 0; x2 = –15 + √230 〇 x1 = –15 + √230 〇 x1 = –15 – √230; x2 = –15 + √230
х2+30x–5=0, D=900+20=920=(2√230)2, x=(–30 ±2√230)/2, x=–15 ±√230, х1=–15–√230, х2=–15+√230. Ответ: –15–√230, –15+√230.