Question

Multiply the following complex numbers: (-7+squ.7i) and (squ.7 + i). Show all work and explain the steps you are taking in the work.

Answer 1

-56+42i

Explanation:

(-7+7i)(7+I)

Using expansion method

(-7×7)+(-7×i)+(7i×7)+(7i×i)

-49-7i+49i+7i^2(because i^2=-1)

therefore -1×+7=-7

collect like terms

-49-7-7i+49i

-56+42i