Monday
April 21, 2014

Homework Help: can someone please help me?

Posted by Shay on Thursday, January 18, 2007 at 4:53pm.

simplify the following expressions involving complex numbers.
(3+2i)-(-7-i)

10 + 3i

how did you do that?
can you show me this one and explain how this time?

(3+2i)(-7-i)

or even

(3-2i)^2

you would do 3+2i=5i, then -7-i=7i then 5i+7i=12i

(3+2i)-(-7-i) =

(3+2i) + (7 + i) =

3 + 7 + 2i + i =

10 + 3i


(3+2i)*(-7-i) =

-(3+2i)*(7 + i) =

-[3*7 + 3*i + 2i*7 +2i*i] =

-[21 + 3i + 14i - 2] =

-[19 + 17i]


(3-2i)^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^2-sx+3k
intersects the x-axis 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

Answer this Question

First Name:
School Subject:
Answer:

Related Questions

math - simplify the following expressions involving complex numbers. (3+2i)-(-7-...
math - simplify the following expressions involving complex numbers. (3+2i)-(-7-...
check my work please! - ok i have to divide complex numbers: question is: 1-2i+i...
math help people lik really desperate!! - ok i have to divide complex numbers: ...
Pre-Calculus/Trig Check please and help - Could someone please check the first ...
math-complex numbers - Sketch the sets of complex numbers in the complex plane ...
algebra2-imaginary numbers - You can add or subtract complex numbers by treating...
Algebra - Multiply. x-(6+2i)][x-(6-2i)] Note that these expressions contain ...
Algebra 2 - Operations with Complex Numbers Simplify. 1. sqrt(-144) 2. sqrt(-64x...
ALGEBRA!! - calculate P(i) for the following polynomial p(x)=x3+2x2-5x+8 Find | ...

Search
Members