Ответы
Ответ:
Пошаговое объяснение:
№1
1) (3p+8 = 9
+ 48p + 64
2) (2m - 5)(2m + 5
3) (-5c - 8d = 25
+ 80cd + 64
4) (2 = 36
№2
1) 49 = (7z - 3)(7z +3)
2) -81 =
3) 49 =
№3
1) (2x - 7)(x + 1) + 3(4x - 1)(4x + 1) = 2(5x - 2 - 53
2 +2x -7x +3(
-1) = 2(25
2 + 2x - 7x - 7 + 48
50 - 5x - 10 = 50
-5x + 40x = - 45 +10
35x = -35
x = -1
2) (5x + 3 - 36 = 0
(5x - 3 + 6)(5x - 3 - 6) = 0
(5x - 9)(5x +3) = 0
5x - 9 = 0 или 5x +3 = 0
x = = 1,8 x =
= -0,6
3) (4m +3 - (2m - 6
16 + 24m + 9 - 4
12 + 48m - 27 = 0
4 + 18m - 9 = 0
2m*(2m + 9) - (2m +9) = 0
(2m - 1)(2m + 9) = 0
2m + 9 = 0 или 2m - 1 = 0
m = = - 4,5 m =
= 0,5
4) (x + 7 + (x - 9
2 - 4x + 130 = 18x + 126 - 2
2 - 4x + 130 - 4x - 126 + 2
4 - 8x + 4 = 0
- 2x + 1 = 0
(x - 1 = 0
x - 1 = 0
x = 1
№4
- 8x + 17 = 0
D = ( - 8 - 4 * 2 * 17 = 64 - 136 = - 72
При отрицательном дискриминанте выражение не может равняться нулю