1) (6y-7)^2 - (9y+4)^2 = (6y-7-9y-4)(6y-7+9y+4) = (-3y-11)(15y-3) = -3(y+11)(15y-3)
2) (2c+1)^3 - 64 = (2c+1-4)(4(2c+1)+4+16) = (2c-3)(8c+4+16) = (2c-3)(8c+20) = 2(2c-3)(4c+10)
3) 8 - (3-k)^3 = 8 - (27 - 9k + k^3) = -19 + 9k - k^3
Ответ: -19 + 9k - k^3
1) (6y-7)^2 - (9y+4)^2 = (6y-7-9y-4)(6y-7+9y+4) = (-3y-11)(15y-3) = -3(y+11)(15y-3)
2) (2c+1)^3 - 64 = (2c+1-4)(4(2c+1)+4+16) = (2c-3)(8c+4+16) = (2c-3)(8c+20) = 2(2c-3)(4c+10)
3) 8 - (3-k)^3 = 8 - (27 - 9k + k^3) = -19 + 9k - k^3
Ответ: -19 + 9k - k^3