Question

(a+3)(a^2+a-7)
розложыть на множытели

Answer 1

$(a + 3)(a {}^{2} + a - 7) = a \times (a {}^{2} + a - 7) + 3(a {}^{2} + a - 7) = a {}^{3} + a {}^{2} - 7a + 3a {}^{2} + 3a - 21 = a {}^{3} + 4a {}^{2} - 4a - 21$