Question

Multiply (2 – 71)(-1 + 47)

Answer 1

(2-7i)(-1+4i)
2x-1=-2
2x4i= 8i
-7ix-1=7i
-7ix4i=-28i^2

so the answer is
-2+8i+7i+28i^2
=28i^2+15i-2

:)

Answer 2

Will this help? You can only Multiply the Same variables. I need to sleep now :)