Question

Express in the form of a+ib (1+3i) (-3+i)

Answer 1

Answer:

$(1 + 3i)( - 3 + i) \\ \\ - 3 + i - 9i + 3 {i}^{2} \\ \\ - 3 - 8i + 3( { - 1}) \\ \\ - 3 - 8i - 3 \\ \\ - 9 - 8i \\ \\ - 9 + i( - 8)$