Вправи 1001 - 1100 » 1085

1085. Розклади на множники тричлен: б) c2 – √2c – 4 = (c – 2√2)(c + √2); c = (√(2 )± √(2+16))/2 = (√2 ±3√2)/2; c1 = (4√2)/2 = 2√2; c2 = (-2√2)/2 = –√2; в) 1,5y2 – 3y + 4/3; y = (3 ± √(9-4 •1,5 • 4/3))/3 = (3 ±1)/3; y1 = 11/3; y2 = 2/3.