Questions on Algebra: Complex Numbers answered by real tutors!

Tutors Answer Your Questions about Complex Numbers (FREE)

Question 253915: Express the product of 4 � 3i and 2 + i in simplest a + bi form.
1. 2 + 11i
2. 2 � 11i
3. 11 + 2i
4. 11 � 2i
I have an application on my graphing calculator allowing me to add/subtract/multiply/or divide complex numbers. I used that and came up with 4-5i? Yet that isn't an answer choice?
Click here to see answer by richwmiller(17219)

Question 253834: 1. Write the a + bi form of (7 - i)^2 (simplify)
2. R = 1/3a(x + c) solve for x
3. x^2 + 2x + 4 = 0

Click here to see answer by ankor@dixie-net.com(22740)

Question 254082: what is square root of 13 over 28?
Click here to see answer by edjones(8007)

Question 254138: 7
- +11
x
__________
2
- -2
3x

Click here to see answer by richwmiller(17219)

Question 254352: How do you simply the following: 3i/5+i?
Click here to see answer by stanbon(75887)

Question 254386: Please help me solve this equation to get y....
Click here to see answer by richwmiller(17219)

Question 254519: A random variable is uniformly distributed over [0,1]. what is its skew?
Click here to see answer by solver91311(24713)

Question 254515: The second order derivative d^2f/dx^2 of f (x)= x exp (-x) is?

Click here to see answer by Alan3354(69443)

Question 254557: What is the value of the limiting problem lim (x+h)^3 � x^3/ h
h→0
Click here to see answer by solver91311(24713)

Question 254836: Still having problems with graphing...
Solve by graphing.
2x+y=5
3X-y=10
Here is what I have so far. y=3x-10 & y=-2x+5, but still do not know how to graph if that is correct.
Click here to see answer by vksarvepalli(154)

Question 254835: I asked a couple of graphing problems the other day hoping to learn how to do the next few, but here it goes...
Solve by graphing.
3x+2y=8
6x+4y=16
Here is what I came up with, but even if this is right...I do not know how to graph it. y=-1x+8 and 4y=-6x+16 ???
Click here to see answer by richwmiller(17219)

Question 254839: Given the pair of inequalities,
y>x+1
y < 3/2 x + 3
graph their solution set.

Thanks again for the help!
Click here to see answer by richwmiller(17219)

Question 254838: Graph
y (> or equal to sign)2x + 1
Is this the final form of the equation? Then just graph?
I think I have this one, but would like to see your graph for comparisons. Thank you for this great sight!
Click here to see answer by stanbon(75887)

Question 254887: If f(x,y)=x^2-4xy+y^3+4y, the sum fxx +fyy is given by?
A) 2-6y B)0 C)2x+4 D)-4(x+y), E)none of the above
Click here to see answer by Fombitz(32388)

Question 254922: -3+i over 5+2i + (2+2i)

Click here to see answer by Alan3354(69443)

Question 255196: 7+3i/3+9i
Click here to see answer by dabanfield(803)

Question 255207: what is the solution set of (6x+4)squared=77
Click here to see answer by checkley77(12844)

Question 255575: how do you solve A to the 4th power + 2A squared - 15= 0 using complex equation
Click here to see answer by vleith(2983)

Question 255905: simplify each number by using the imaginary number i
-2 with a fraction bar over it
Click here to see answer by drk(1908)

Question 256096:
Click here to see answer by Edwin McCravy(20056)

Question 256124: 7+3i
____
3+9i
how do you write this expression as a complex number in standard form?
Click here to see answer by solver91311(24713)

Question 256124: 7+3i
____
3+9i
how do you write this expression as a complex number in standard form?
Click here to see answer by EMStelley(208)

Question 256125: how do you factor the polynomial x^4-8x^2-9
Click here to see answer by drk(1908)

Question 256188: Find the absolute value of each complex number
1. 7i
2. 12
3. -3 - 2i
Click here to see answer by drk(1908)

Question 256204: Solve each quadratic equation.
1. 2x^2 - 3x - 11 = 0
2. 3x^2 + 48 = 0
3. 2x^2 - x + 1 = 0

Click here to see answer by drk(1908)

Question 256204: Solve each quadratic equation.
1. 2x^2 - 3x - 11 = 0
2. 3x^2 + 48 = 0
3. 2x^2 - x + 1 = 0

Click here to see answer by checkley77(12844)

Question 256439: ron was doodling in his notebook and noticed the following: 3 segments can be drawn between 3 points, 6 segments can be drawn between 4 points, and 10 segments can be drawn between 5 points.
a. find an equation giving the number of segments "y" as a function of the number of points "x".
b. according o this formula howmany segments can be drawn between 70 points.
c. how many points are needed to draw 45 segments between them.
Click here to see answer by drk(1908)

Question 256436: write in a+bi form- a(3+7i)+(5+i)(-3+6i)
Click here to see answer by drk(1908)

Question 256888: Determine those values of k for which

k k
8 4k

= 0
Click here to see answer by Fombitz(32388)

Question 247920: my problem are plz help me i need to see the work
i need them solved by tonight plz
1) x^2-8x+15=0

2) x^2+2x-6=0

3) 2x^2+3x-5=0

4) 2x^2+7x+6=0

4) x^2-4x+5=0

5) x^2-10x+28=0
Click here to see answer by Alan3354(69443)

Question 257597: 3x(2x-5)(3x+1) = 0
Click here to see answer by jmorgan22(8)

Question 257838: write the expression as a square binomial. x^2 -3x +9/4
Click here to see answer by richwmiller(17219)

Question 258433: I am given z=(5.5+5.5i);determine z^4
I multiplied it all out and used i^1=i, i^2=-1, i^3=-i, i^4=1. I got -14660.283 and its not right. Any help?
Click here to see answer by Alan3354(69443)

Question 258686: (-4-6i)-(3+2i)
Click here to see answer by i-am-007(1)

Question 258694: 1/2+2i
Click here to see answer by Fombitz(32388)

Question 259033: (5+3i)+(8-2i)
Click here to see answer by drk(1908)

Question 259035: (5-9i)-(3+7i)
Click here to see answer by palanisamy(496)

Question 259302: i do not get complex numbers

Click here to see answer by Alan3354(69443)

Question 259385: (5-i) - (3-2i)
Click here to see answer by richwmiller(17219)

Question 259381: 7x^2 + 84 = 0
Click here to see answer by Edwin McCravy(20056)

Question 260105: i tried solving ( square root of x-1) = -2 and my answer was 5, the book says its 0. help please
Click here to see answer by jim_thompson5910(35256)

Question 260155: AxBy=c
Click here to see answer by richwmiller(17219)

Question 260356: Is the answer to i(6+i)(3-2i)= 20i + 9?
Click here to see answer by richwmiller(17219)

Question 260380: (5i-3)(2i-3)=
Click here to see answer by drk(1908)

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