Questions on Algebra: Complex Numbers answered by real tutors!

Tutors Answer Your Questions about Complex Numbers (FREE)

Question 64998: xsquared + 4x + 1 = 0
Click here to see answer by checkley71(8403)

Question 65104: Find the absolute value of the complex number. 3i-2
Click here to see answer by stanbon(57282)

Question 65104: Find the absolute value of the complex number. 3i-2
Click here to see answer by joyofmath(189)

Question 65147: The conjugate of 5 + 6i is
Find the product (2 + i)(3 + 4i). Give your answer in the usual a + bi form
Write the complex number i 15 in the usual a + bi form
Find the reciprocal of the complex number 3 + 2i . Give your answer in the usual a + bi form.
Write the complex number in the usual a + bi form.
What are the coordinates of the complex number -i when we plot it in the complex plane?
Find the magnitude of the complex number 3 - 7i. (In other words, find | 3 - 7i | )
Click here to see answer by stanbon(57282)

Question 65089: Solve
3/8x - 1/2y = 1
0.2x + 0.6y = 4
Click here to see answer by checkley71(8403)

Question 65224: I'm having problems figuring out what this answer is using complex numbers. Please help! Solve in the complex number system. 8x^3 + 27 = 0
Click here to see answer by venugopalramana(3286)

Question 64801: We are to use interval notation for the solution set, I am still confused with this. Can you help?
2<2x+4<10
Here is another
3x-6=-3(2-x)
thankyou, lackinmathe
Click here to see answer by 303795(595)

Question 65202: 2x-y+4z=19
-x+3y-2z=-7
4x+2y+3y=37
Click here to see answer by stanbon(57282)

Question 65333: what is the smallest positive integar which uses only the digits 0 and 1 and is divisible by 225?...answer must be exact
thank you for ur help..it is most appreciated..[= [= [=
Click here to see answer by stanbon(57282)

Question 65436: Simplify
-3i^2 + 4i - 5 times the square root of -9 - 4 + 5i^3
Click here to see answer by Edwin McCravy(8891)

Question 65539: Write 3R - 2U in polar form.
Click here to see answer by stanbon(57282)

Question 65540: Solve:
RcTc = 360, RmTm = 480 Rm = 2Rc Tm+Tc = 15
Click here to see answer by stanbon(57282)

Question 65800: simplify
5 - 6i / i - 3
Click here to see answer by funmath(2925)

Question 65864: The expression: 2+i/3+i is equivalent to?
a)6+5i/8
b)6+i/8
c)7-5i/10
d)7+i/10

Click here to see answer by ptaylor(2048)

Question 65903: Solve for x given: (5+i)x+(1-3i)=(2-3i)x+(2-i)
* ( i ) is understood to be the square root of -1

Click here to see answer by stanbon(57282)

Question 65972: Hello! I'm having trouble with this equation because I don't know how to solve for "k". Here is the equation.
If 1+2i is a root of x^2-kx+6=0, find k.
Can you help me out?
Sincerely,
Leanne Spence
Click here to see answer by Edwin McCravy(8891)

Question 66686: Please help me to solve this equation What is x?
Click here to see answer by Earlsdon(6287)

Question 66726: I'm not sure what this is or how to solve it
it is (n+1)! divided by n! with all of that answer subtracted by n equals what
again ((n+1)!/(n!)) -1
Click here to see answer by stanbon(57282)

Question 66768: -8-6(x+2)=.2(x-5)

Click here to see answer by checkley71(8403)

Question 66786: 1+ or - 3i/2= ?????????????????
How do you do it? Please help , Thank You
(This question didn't come out of a book, our teacher gave it to us on a paper.)
Click here to see answer by stanbon(57282)

Question 66788: Find a quadratic equation with roots 5 and -1/2.
A. 2x^2+9x-5=0
B. 2x^2-9x+5=0
C. 2x^2+9x+5=0 (I know that this isn't the true answer.)
D. 2x^2-9x-5=0
I need help, I have looked @ many references, and found nothing.
Click here to see answer by stanbon(57282)

Question 66792: Solve by completing the square.
2x^2-12x-18=0
How do you do it. Thanks
Click here to see answer by Earlsdon(6287)

Question 66792: Solve by completing the square.
2x^2-12x-18=0
How do you do it. Thanks
Click here to see answer by ptaylor(2048)

Question 66957: If r is the root of f(x)=x^2-4 and t is the root of g(x)= x^2 -25 what is the value of lr-til
Click here to see answer by stanbon(57282)

Question 67022: how to do these equations
(-4+3i)+(6-10i)
(1-4i)-(-3+5i)
(-2+3i)*(4-8i)
(-1+2i)/(-3+4i)
Click here to see answer by venugopalramana(3286)

Question 67175: how to do these questions?
(-2+3i)*(4-8i)=

(1-6i)*(-2+2i)=
Click here to see answer by josmiceli(9664)

Question 67188: How do I solve (square root of 3 over 2+3i)2
the 2 outside the () is a square
thank you
Click here to see answer by ankor@dixie-net.com(15645)

Question 67434: Find the 4 roots of the equation:
x^4+kx^2+1=0
k^2<4
Click here to see answer by Nate(3500)

Question 67489: I bought two books for a total cost of $40. If the first book's price were raised 5% and the second's lowered 5%, the prices would be equal. What was the original price, in dollas, of the cheaper book?

Click here to see answer by stanbon(57282)

Question 67488: An isosceles right triangle is removed from each corner of a square piece of paper so that a rectangle remains. What is the lenght of a diagonal of the rectangle if the sum of the areas of the cut-off pieces is 200?
Click here to see answer by ankor@dixie-net.com(15645)

Question 67498: The forty-eight faces of eight unit cubes are painted white. What is the smallest number of these faces that can be repainted black so that it becomes impossible to arrange the cubes into a 2x2x2 cube, each of whose six faces is totally white?
Click here to see answer by 303795(595)

Question 67570: solve the system of equations:
4x-3y=8
2x+5y=-9
a.(-2,1)
b.(2,0)
c.(0,-83)
d.(1/2,-2)
Click here to see answer by checkley71(8403)

Question 67733: 2 + 3i/4 + i
I have tried the following:
(2+3i/4+i)*(4-i/4-i)
(8+10i-3i^2)/16-i^2
11-10i/5
I think I'm soo confused.

Click here to see answer by Earlsdon(6287)

Question 67733: 2 + 3i/4 + i
I have tried the following:
(2+3i/4+i)*(4-i/4-i)
(8+10i-3i^2)/16-i^2
11-10i/5
I think I'm soo confused.

Click here to see answer by ankor@dixie-net.com(15645)

Question 68071: Please help me solve this problem:
Siplify:

I know that i have to find a least common multiple but i don't know how to finish it.
Thank you very much!!!

Click here to see answer by adamchapman(301)

Question 68181: radical notation -10
Click here to see answer by checkley71(8403)

Question 68317: I do not understand how they got the answer for this problem.
3
The answer is
Please break it down for me.
Thank you for your time.

Click here to see answer by rmromero(383)

Question 68409: solve the equation x2=-16
Click here to see answer by checkley71(8403)

Question 68424: solve the equation x^2=-81
Click here to see answer by rmromero(383)

Question 68421: solve the equation x^2-7=4x^2+5
Click here to see answer by rmromero(383)

Question 68419: solve this equation x^2+144=0
Click here to see answer by rmromero(383)

Question 68561: Please help me with these questions I have for my year nine homework.
1 Simplify the following by collecting the like terms.
-6-3x+4-x
2 Expand the following by removing the brackets
-6(5x-4)
3 Expand and simplify the following.
(x-6)(x+6)
4 Factorise the following using the highest common factor.
4q2+10q8
Click here to see answer by rmromero(383)

Question 68484: (5-2i)+(-7+5i)
Click here to see answer by funmath(2925)

Question 68496: A car rental company charges $50.00 per day plus $0.80 per mile for a full-size car, and charges $30.00 per day plus $0.50 per mile for a compact car. Write an expression in simplest form that gives the amount, in dollars, that the charges for a full-size car exceeds the charge for a compact car, when each is rented for x days and y miles.

Click here to see answer by Earlsdon(6287)

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