Question

(1+ i) (-1+2i)
simplify

Answer 1

-1+2i-i+2i^2 when multiplied.

i^2=-1
so
-1+2i-i-2= -3+i

Answer 2

-1+2i-i+2i^2
-1+i+2i^2
-1+i+2(-1)
-3+i

Answer 3

i dont understand

Answer 4

use the FOIL method for factoring. first term in first parenthesis x first term in second parenthesis. Then add that to: first term in first parenthesis x 2nd term in second parenthesis. Add that to: second term in first parenthesis x first term in second parenthesis. Then add that to: second term in first parenthesis x second term in second parenthesis. I know that sounds confusing so here is a picture: