Multiply and write your answer as a complex number in simplest form (no spaces): (-7i)(-4 + 3i)

Question

Multiply and write your answer as a complex number in simplest form (no spaces): (-7i)(-4 + 3i)

Answer 1

You must distribute and also recognize that i² = -1,

so, distributing the 7i yields 28i - 21i² Now i²=-1 so we get

28i + 21 and the proper form is

21+28i