Ответы на вопрос:
X² + 4x - 77 = 0 d=b² - 4ac = 16 - 4 × (-77) = 16 + 308 = 324 = 18² x1 = ( - 4 + 18) / 2 = 7 x2 = ( - 4 - 18) / 2 = - 11 ответ: x1 = 7, x2 = - 11 x² - 3x - 54 = 0 d = b² - 4ac = 9 - 4 ×(- 54 )= 9 + 216 = 225 = 15² x1 = ( 3 + 15)/2 = 9 x2 = ( 3 - 15) / 2 = - 6 ответ: x1 = 9, x2 = - 6 x² - 2x - 63 = 0 d = b² - 4ac = 4 - 4 × (-63) = 4 + 252 = 256 = 16² x1 = ( 2 + 16) / 2 = 9 x2 = ( 2 - 16) / 2 = - 7 ответ: x1 = 9, x2 = - 7 x² + 12x - 85 = 0 d = b² - 4ac = 144 - 4 × ( - 85) = 144 + 340 = 484 = 22² x1 = ( - 12 + 22) / 2 = 5 x2 = ( - 12 - 22) / 2 = - 17 ответ: x1 = 5, x2 = - 17
Популярно: Математика
-
AVRORA44429.03.2023 00:49
-
Isei24.03.2020 23:36
-
LeenBoom6909.05.2022 18:31
-
Elina115121.02.2021 10:19
-
геля56987809.06.2023 19:36
-
fatimatagiyeva09.09.2022 19:46
-
marusiatabakova200623.05.2022 11:04
-
albina100206.12.2020 19:50
-
georggeorg06.01.2021 22:44
-
bceznaika212.09.2020 11:17