а) (8x-7b)(8x-7b) = 64x^2 - 56bx - 56bx + 49b^2 = 64x^2 - 112bx + 49b^2
б) (15c^6-1)(15c^3+1) = 225c^9 + 15c^6 - 15c^3 - 1 = 225c^9 + 15c^6 - 15c^3 - 1
а) (8x-7b)(8x-7b) = 64x^2 - 56bx - 56bx + 49b^2 = 64x^2 - 112bx + 49b^2
б) (15c^6-1)(15c^3+1) = 225c^9 + 15c^6 - 15c^3 - 1 = 225c^9 + 15c^6 - 15c^3 - 1