Question

Шестой помогите пожалста

Answer 1

$(a + 1)(a - 1)(a^2 + 1) - (9 + a^2)^2 = (a^2 - 1^2)(a^2 + 1) - (9 + a^2)^2 = \ (a^2 - 1)(a^2 + 1) - (9 + a^2)^2 = ((a^2)^2 - 1^2) - (9 + a^2)^2 = (a^4 - 1) - \ (9^2 + 2 * 9 * a^2 + (a^2)^2) = a^4 - 1 - 81 - 18a^2 - a^4 = -18a^2 - 82 = \ -18 (frac{1}{3})^2 - 82 = -18 frac{1}{9} - 82 = - 2 - 82 = -84$