Question

0,2а2(а2-4а+1)-0,4а(а3+12а2-8а)

Answer 1

$0.2a2(a2 - 4a + 1) - 0.4a(a3 + 12a2 - 8a) \\ 0.4a \times (2a - 4a + 1) - 0.4a \times (3a + 24a - 8a) \\ 0.4a \times ( - 2a + 1) - 0.4a \times 19a \\ - 0.8a {}^{2} + 0.4a - 7.6a {}^{2} \\ - 8.4a {}^{2} +0.4a$