can someone please help me?
posted by Shay .
simplify the following expressions involving complex numbers.
(3+2i)(7i)
10 + 3i
how did you do that?
can you show me this one and explain how this time?
(3+2i)(7i)
or even
(32i)^2
you would do 3+2i=5i, then 7i=7i then 5i+7i=12i
(3+2i)(7i) =
(3+2i) + (7 + i) =
3 + 7 + 2i + i =
10 + 3i
(3+2i)*(7i) =
(3+2i)*(7 + i) =
[3*7 + 3*i + 2i*7 +2i*i] =
[21 + 3i + 14i  2] =
[19 + 17i]
(32i)^2 =
9  12i  4 =
5  12 i
thankyou, you are very good at math!
can you help with this one please and thankyou?
Determine the values of k if the graph of
y=2x^2sx+3k
intersects the xaxis at 2 distinct points.
Thanks!
a x^2 + bx + c = 0 has two different roots if the discriminant D defined as:
D = b^2  4 a c does not equal zero.
If a, b and c are real numbers then for D > 0 there are two real roots while for D < 0 there are two complex roots.
In this problem we have to demand that D > 0 >
D = s^2  24 k > 0 >
k < s^2/24

if anyone knows the answer please help me on this one too!
Respond to this Question
Similar Questions

math
simplify the following expressions involving complex numbers. (3+2i)(7i) is i like x? 
math
simplify the following expressions involving complex numbers. (3+2i)(7i) is i like x? 
algebra,math,help
Use Property 2 to simplify each of the following radical expressions. sqrt (10)/ sqrt(49) My answer: sqrt (10) / (7) THis next one i need help: Use the properties for radicals to simplify each of the following expressions. Assume that … 
math, correction,plz
can someone correct these for me plz.... Problem#36 Use Property 2 to simplify each of the following radical expressions. Radical (10)/(49) My answer: (radical(2 times 5))/(7) Use the properties for radicals to simplify each of the … 
Math  Complex Numbers
Could someone show me how to get the work for: 3/4 (sqrt)16/25 ? 
algebra
Can someone please help me with these problems? 
Algebra II
Simplify this complex expressions to simple expressions. 1  _9_ x^2 __________ 1  _3_ x please help me .. 
Algebra
Multiply. x(6+2i)][x(62i)] Note that these expressions contain complex numbers. Simplify your answer as much as possible. 
Geometry
CounterExamples and Inductive Reasoning and Conjectures? 
AP Calculus
Show work to determine if the relation is even, odd, or neither. 1. 3x=y (y=abs. value of y) Simplify the following complex fractions. 2. [(3/x)(4/y)]/[(4/x)(3/y)] PLEASE HELP!