Questions on Algebra: Complex Numbers answered by real tutors!

Tutors Answer Your Questions about Complex Numbers (FREE)

Question 88429: Find the value of x.
x=3s
x=(a+15)
s=(a-1)
Click here to see answer by stanbon(57962)

Question 88428: 9s=6a
s=2x
a=(x+.24)
Find the value of each variable.
Click here to see answer by stanbon(57962)

Question 88431: what hard is algebra?
please show a saple!
Click here to see answer by checkley75(3666)

Question 88477: help please!! (-8+3i)+(-8-3i) thanks
Click here to see answer by ankor@dixie-net.com(15746)

Question 88295: PLEASE HELP ME!! THANK YOU LOTS
find the mass and radius of three of the nine planets in our solar system. Be sure that the masses are expressed in kilograms and the radii are expressed in meters.
Using your data, calculate the gravitational acceleration on each of the three planets you selected. Note: With the masses measured in kilograms and the radii in meters, the units of gravitational acceleration would turn out to be meters per squared seconds.
Use the gravitational accelerations that you calculated in Step 2 to find the period of a 2 meter long simple pendulum on each of the three planets. Note: The length of a simple pendulum is normally expressed in meters, so it is sufficient to replace L with the number 2 in the period expression.
Please submit your assignment.

Click here to see answer by bucky(2189)

Question 88516: i need to simplify (5+ the square root of -8) + (-13+4 times the square root of -2)
(5+sqrt(-8))+(-13+4sqrt(-2))
Click here to see answer by rob9926(2)

Question 88516: i need to simplify (5+ the square root of -8) + (-13+4 times the square root of -2)
(5+sqrt(-8))+(-13+4sqrt(-2))
Click here to see answer by jim_thompson5910(28708)

Question 88519: how do you simplfy i to the 91th power
Click here to see answer by stanbon(57962)

Question 88623: Solve 2(x-1)^2 = -16 over the set of complex numbers.
Click here to see answer by Nate(3500)

Question 88624: Solve x^3 - 4x^2 - 2x + 20 = 0 over the set of complex numbers.
Click here to see answer by Nate(3500)

Question 89821: How would you graph a graphical interpretation of the problem (5-6i) and (-3+i)? I worked the problem and came up with 2-5i, but am unsure how to graph it.
Click here to see answer by scott8148(6628)

Question 90171: I've been given this problem and I keep getting stuck half was down it and going back on myself, wondered i f anyone could help out with it.
Given that
cos x = (e^jx + e^-jx)/2 and
sin x = (e^jx - e^-jx)/2j
and using only this information, prove that
cos^2 x - sin^2 x = 1 - 2sin^2 x
Click here to see answer by kev82(148)

Question 90285: Could someone please assist me with this question:
Find the solution to this equation:
2b^2+9=0
Thank you.
Click here to see answer by stanbon(57962)

Question 90415: Hello, how do i simplify (9 - 5i)(1 + 3i)
Click here to see answer by jim_thompson5910(28708)

Question 90415: Hello, how do i simplify (9 - 5i)(1 + 3i)
Click here to see answer by checkley75(3666)

Question 90564: Hi, how do i perform the following operation and express it in standard form?
2 - 6i / 4 - 9i
Click here to see answer by bucky(2189)

Question 91561: A TOTAL OF 27,000 IS INVESTED , PART OF IT AT 12% PART OF IT AT 13%. THE TOTAL INTEREST AFTER A YEAR IS 3,385 . HOW MUCH WAS INVESTED AT EACH RATE?
Click here to see answer by stanbon(57962)

Question 92070: please help me simplify sqrt (-25) sqrt (-9)
Click here to see answer by Nate(3500)

Question 92070: please help me simplify sqrt (-25) sqrt (-9)
Click here to see answer by funmath(2925)

Question 92072: please help me simplify ( 2+3i ) ( 2 - 3i )
Click here to see answer by Nate(3500)

Question 92072: please help me simplify ( 2+3i ) ( 2 - 3i )
Click here to see answer by funmath(2925)

Question 92522: I find it difficult to grasp the idea of 'x raised to the power i (or multiple of i', or indeed 'x raised to the power of a general complex number'. I can understand 2^3, 3^0.5 etc., but what is the meaning of, say, 3^i, 3^(2+3i) etc. What are, say, '3^i', '3^(2+3i)', and why? How does this relate to Euler's formula?
The problem comes from reading 'The Road to Reality' by Roger Penrose, ISBN no 0-224-04447-8, p90 (section 5.2 entitled 'The Idea of the Complex Logarithm'). Real logarithms - OK: complex ones I just can't quite grasp.
Click here to see answer by Nate(3500)

Question 92640: I am asked to find all solutions, real or complex:
(3x+1)^2=-12
I have no idea how to even start this type of problem, your help would be greatly appreciated!
Click here to see answer by ankor@dixie-net.com(15746)

Question 92696: I need to know if my answers are correct. I am to classify each of the problems as real and rational, real and irrational, or imaginary. Are my answers correct?
a. (2)^1/2 + 2 - Real and rational
b. i - Imaginary
c. 0 - Real and rational
d. 3-(-5)^½ i - Real and imaginary
e. (100)^1/5 – Real and rational
f. 30007 - Real and rational
g. (8)^1/3 - Real and rational
h. 4+0i - Imaginary

Click here to see answer by stanbon(57962)

Question 93128: if z1=2+j, z2=3+j and z3=j3
what is the equivalent impedance z if z= z1 + z2 + z3 also if
1/z= 1/z1 + 1/z2 + 1/z3 ?? this was a question given to us for homework and it was not in any text book also i have to express my answer for z in both rectangular and polar form and draw an argand diagram
Click here to see answer by stanbon(57962)

Question 93127: if z1=2+j, z2=3+j and z3=j3
what is the equivalent impedance z if
1/z= 1/z1 + 1/z2 + 1/z3 ?? this was a question given to us for homework and it was not in any text book
Click here to see answer by Edwin McCravy(8999)

Question 93194: Solve each equation for x. Find any restrictions.
ax+bx=c
Click here to see answer by Nate(3500)

Question 93422: 4sqrt (x) = 20 please help me solve for the unknown and show all work
Click here to see answer by checkley75(3666)

Question 93423: sqrt (y) + sqrt (y+7) = 7 please help me solve for the unknown and show all work
Click here to see answer by ankor@dixie-net.com(15746)

Question 93619: Can you please help me simplify this: 5a-a
Click here to see answer by edjones(7569)

Question 93622: Can you please help me simplify this: 3y + (4y + 6x)
Click here to see answer by crimson moonlight(1)

Question 93621: Can you please help me simplify this: 2(5y - 2) + x
Click here to see answer by tutorcecilia(2152)

Question 93620: Can you please help me simplify this: 3y - (4y + 6x)
Click here to see answer by praseenakos@yahoo.com(507)

Question 94091: two planes left an airport at noon. one flew east at a certain speed and the other flew west at twice the speed. the planes were 2700 mi apart in 3 h. how fast was each plane flying?
Click here to see answer by checkley75(3666)

Question 94100: Hello
I need some assistance with this one Ta. It is asking me to: Write a full solution for the following:
A journey takes 1.5 hours longer at 50kph than it does at 75kph. Find the length of the journey.
Thank you
Dave
Click here to see answer by checkley75(3666)

Question 94123: y=9-3x
x=8-2y
I need to solve x and y values please help!
Click here to see answer by elizaldecalaunan(5)

Question 94123: y=9-3x
x=8-2y
I need to solve x and y values please help!
Click here to see answer by chitra(359)

Question 94121: Any help would be really appreciated please. Ta
This is the last of my problems for now, I am really stuck. I do not know how to get the x and the y onto the same side with the = at the end. Ta
I have solve for X and Y
y=9-3x
x=8-2y
Click here to see answer by checkley75(3666)

Question 94169: please help simplify

Click here to see answer by Edwin McCravy(8999)

Question 94171: yvo gh

Click here to see answer by stanbon(57962)

Question 94171: yvo gh

Click here to see answer by kiesha(1)

Question 94181: Can someone also tell me What are (a) the x-intercepts, (b) the y-intercepts and (c) the foci of the ellipse
x^2/25 + y^2/36 = 1
(a)_________
(b)_________
(c)_________
Click here to see answer by Edwin McCravy(8999)

Question 94394: How do I get this formula to read with the r on the left hand side reading r = ???????
V = 1/3 3.142 r2 h
I really would love some help. Thank you oh so much.
Click here to see answer by stanbon(57962)

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