Question

(a+1)^2-(a-2)(a+4) упростить выражение

Answer 1

$(a + 1) {}^{2} - (a - 2)(a + 4) \\ a {}^{2} + 2a + 1 - (a {}^{2} + 4a - 2a - 8) \\ a {}^{2} + 2a + 1 - (a {}^{2} + 2a - 8) \\ a {}^{2} + 2a + 1 - a {}^{2} - 2a + 8 \\ 2a + 1 - 2a + 8 \\ 1 + 8 = 9. \\ 9.$