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 ?

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) (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.

RELATED QUESTIONS
Directions: Simplify the following- 1. 7i^5-8i^4+5i^3-4i^2 2.... (answered by MathLover1)

simplify... (answered by ikleyn)

Hello. My son is struggling with complex numbers and this stuff is like a second language (answered by stanbon,MathLover1)

I need to know how to write a polynomial equation with the smallest degree with the... (answered by Alan3354)

Please help! I have so simplify each expression: 1. (2 + 3i) + (4+ 5i) 2. (5 +... (answered by solver91311)

I'm on algebra 2 and need help with my work please. It says find the value of the complex (answered by richwmiller)

MULTIPLY AND SIMPLIFY 5i(4i-6) (answered by longjonsilver)

2-i / 3-4i ,2-i/3-4i*3+4i/3+4i, 6+8i_3i_4i^2/15 ,10+5i/15 ,5(2+i)/5(3), 2/3 + 1/3i (answered by nerdybill,himakamel)

Add and simplify.... (answered by ikleyn)