Решите:

(-y+x) (x+y)

(-b-c) (b-c)

(3x²-1) (3x²+1)

(12a³-7x) (-12a³-7x)

(x-3) ² · (x+3) ²

(c+4) ² · (4-c) ²

(- y + x) (x + y) = x² - y²

(- b - c) (b - c) = - (b + c) (b - c) = - (b² - c²) = - b² + c²

(3x² - 1) (3x² + 1) = 9x⁴ - 1

(12a³ - 7x) (- 12a³ - 7x) = - (12a³ + 7x) (12a³ - 7x) = - (144a⁶ - 49x²) =

= - 144a⁶ - 49x²

(x - 3) ² * (x + 3) ² = (x² - 9) ² = x⁴ - 18x² + 81

(c + 4) ² * (4 - c) ² = (16 - c) ² = 256 - 32c + c²