Ответы на вопрос:
1) 14х2 - 5х - 1 = 0 d = 25 + 56 = 81 кор.d = 9 x1 = 5 + 9/ 28 = 0,5 x2 = 5 - 9/ 28 = - 1/7 2) 2x2 + x + 67 = 0 d = 1 - 536 = - 535 розв'язку немає 3) 2p2 + 7p - 30 = 0 d = 49 + 240 = 289 kor.d = 17 p1 = -7 + 17/ 4 = 2,5 p2 = -7 - 17/ 4 = - 6 4) y2 - 3y - 5 = 0 d = 9 + 20 = 29 kor.d = kor z 29 x = 3 + - kor z 29 / 2 5) 5x2 - 11x + 2 = 0 d= 121 - 40 = 81 kor d = 9 x1 = 11 + 9 / 10 = 2 x2 = 11 - 9 / 10 = 0,2 6) 9x2 - 30y + 25 = 0 d = 900 - 900 = 0 x = 30 / 18 = 5/3
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