а) b(a+c)+2a+2c = b(a+c)+2(a+c) = (b+2)(a+c)б) a^3 - a^2 - 3a + 3 = a^2(a-1) - 3(a-1) = (a^2-3)(a-1)в) (b+8)^2 - 4b^2 = b^2 + 16b + 64 - 4b^2 = -3b^2 + 16b + 64 = -b^2 -16b + 64 = -(b+8)^2
а) b(a+c)+2a+2c = b(a+c)+2(a+c) = (b+2)(a+c)
б) a^3 - a^2 - 3a + 3 = a^2(a-1) - 3(a-1) = (a^2-3)(a-1)
в) (b+8)^2 - 4b^2 = b^2 + 16b + 64 - 4b^2 = -3b^2 + 16b + 64 = -b^2 -16b + 64 = -(b+8)^2