can someone please help me?
posted by Shay .
simplify the following expressions involving complex numbers.
10 + 3i
how did you do that?
can you show me this one and explain how this time?
you would do 3+2i=5i, then -7-i=7i then 5i+7i=12i
(3+2i) + (7 + i) =
3 + 7 + 2i + i =
10 + 3i
-(3+2i)*(7 + i) =
-[3*7 + 3*i + 2i*7 +2i*i] =
-[21 + 3i + 14i - 2] =
-[19 + 17i]
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
intersects the x-axis at 2 distinct points.
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!