SOLUTION: i dont know how to simplify the following : (10+15i)-(48-30i) and (6-4i)(6+4i) and (4+3i)(2-5i) any help plz ?

Algebra ->  Complex Numbers Imaginary Numbers Solvers and Lesson -> SOLUTION: i dont know how to simplify the following : (10+15i)-(48-30i) and (6-4i)(6+4i) and (4+3i)(2-5i) any help plz ?      Log On


   

Question 574171: i dont know how to simplify the following :
(10+15i)-(48-30i)
and
(6-4i)(6+4i)
and
(4+3i)(2-5i)
any help plz ?
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
simplify the following :
(10+15i)-(48-30i) = (10-48)+(15+30)i = -38+45i
----------------------------------------------------
and
(6-4i)(6+4i) = 36 + 24i -24i +16 = 52
--------------------------------------------
and
(4+3i)(2-5i) = 8 -20i + 6i +15 = 23 -14i
============================================
cheers,
Stan H.