Questions on Algebra: Complex Numbers answered by real tutors!

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Question 890432: Express the fifth roots of z=-4+4i in exponential form.
Click here to see answer by Theo(13342)

Question 890507: 1. 1
-------- + -------
2(x+1). X-1
____________
1. 1
-------- + ---------
X2-1. X+1
Need help on this complex fraction
Find the LCD of the denominator
Simplfy the complex fraction
Simplfy the numerator
Find the LCD of the numerator
Click here to see answer by josgarithmetic(39613)

Question 891502: I am working with imaginary numbers and just want someone to check my answers to make sure that I fully understand what I am doing.
Simplify:
1/i
Would this just be -i ?
And 1/(2-i)
Would this just be 2+i/5 ?

Click here to see answer by Fombitz(32388)

Question 876815: Simplify each of the following by hand. Show your working and give the
answers in the form a + bi (a, b are real).
(a) i^42
(b) 3+2i/2-5i
(c) (2 cos pi/12 + 2i sin pi/12)^4

Click here to see answer by tommyt3rd(5050)

Question 892259: what is the sum of numbers when one of the three numbers is 8 and the average is 4 and the answer choices can be 16 17 18 or 1.
Click here to see answer by josgarithmetic(39613)

Question 892379: if f(x)=1-x which value is equivalent to f(i)
a. 0
b. 1
c. Square root of 2
d. Square root of -1
Click here to see answer by Fombitz(32388)

Question 892526: Simplify: (2+3x)(1-x)
Is the answer 3x*2("x" squared) - x -2 my answer sheet says it is 5 + x but I don't know why
Click here to see answer by Fombitz(32388)

Question 892820: A number was multiplied by -4 and drecreased by 6. If the final result was -34, what was the number?

i got the answer of 10 but it was mark wrong

Click here to see answer by MathTherapy(10549)

Question 892833: Hi guys,
f(x)=x^2+2x+15
Find all complex numbers for which f(x)=0
I'm at a loss here, I know this should be really easy but after summer I'm at a loss for how to do this. If anyone has any help I'd really appreciate it,preferably with an explanation of the steps. Thanks in advance
Click here to see answer by AnlytcPhil(1806)

Question 892844: If 4x + 2 = 11, what is the value of 2x - 1

I got 3 but it was mark wrong
Click here to see answer by rfer(16322)

Question 892843: Five times a number is 49 greater than the product of 2 and the opposite of the number. What is the number?

I got 9.8 but it was mark wrong.
Click here to see answer by josgarithmetic(39613)

Question 893563: the complex number 4cos135 3isin135 can be written as re^rt in exponentional form find valuea of r and t
Click here to see answer by Fombitz(32388)

Question 893714: How would I solve the problem "(7i)(-6i)(4-8i)"?
Click here to see answer by Alan3354(69443)

Question 893714: How would I solve the problem "(7i)(-6i)(4-8i)"?
Click here to see answer by josgarithmetic(39613)

Question 893893: 1+(1/x^2)=(3/x)
what are the solutions to the equation?
A. x=(3/2)+(square root of 5/2); x=(3/2)-(square root of 5/2)
B.x=(3)+(square root of 5/2); x=(3)-(square root of 5/2)
C.x=(3/2)+(square root of 13/2); x=(3/2)-(square root of 13
Click here to see answer by Fombitz(32388)

Question 894021: he tens digit of a two-digit number is three greater than the ones digit. The difference between ... than the ones digit. The difference between twice the original number and half the number obtained after reversing the digit is 108.
Click here to see answer by lwsshak3(11628)

Question 894079: 1 problem, no answer, and don't understand...
E=0.5 * Iw^2 +U (solve for I) ???
Thank you.
Click here to see answer by josgarithmetic(39613)

Question 894196: The question asked me to express the complex number √-50 - √-8 in the form a+bi. But when I simplified I got 2i√2 and now I'm not sure how to express that in the form a+bi because 2i and √2 are getting multipied
Click here to see answer by josgarithmetic(39613)

Question 894277: How would I solve
(-2i)-3-(-2+7i)?

Click here to see answer by jim_thompson5910(35256)

Question 895084: How do I solve y= 7x/5 + 2/5 solve for y can you show me the steps so I can understand how to solve other problems like this?

Click here to see answer by josgarithmetic(39613)

Question 895445: Determine a, b and c if xy=5+i and x+y=3+2i, given that x=a+bi and y=c-i
Click here to see answer by Fombitz(32388)

Question 895027: How to write (6+3i)+(-4+10i) as a complex number in standard form
Click here to see answer by Fombitz(32388)

Question 895792: Find all real solutions of the equation.
x^3/2 + 18x^1/2 + 81x^−1/2 = 0
Click here to see answer by Fombitz(32388)

Question 896000: Are these statements always, sometimes, or never true? If never, what is a counterexample. If sometimes true, give an example AND counterexample.
1) The difference between any complex number a+bi (b doesn't equal zero) and its conjugate is a real number.(I said ALWAYS because it turned out to always be 0)
2) The product of any two imaginary numbers bi (b doesn't equal zero) and di (d doesn't equal zero) is a positive real number. (I said NEVER TRUE because i * i is -1)
--------------------------------------------------------------------------------------------
Please Answer! Thanks for the help!
Click here to see answer by Theo(13342)

Question 896173: 7i/2-9i
Click here to see answer by Alan3354(69443)

Question 896671: Mr.A has to saw a pipe into Sven pieces.if it take him to four minutes to make one cut ,how long will it take to cut into seven pieces?

Click here to see answer by thesvw(77)

Question 896810: If f (x) = (x^-x - x^0 + 2^x), find the following. (Enter your answer as a fraction or mixed number.)
f (3) =
Click here to see answer by Alan3354(69443)

Question 897306: how do I work the problem z=5-2i and then the conjugant zz=5-2i
Click here to see answer by Fombitz(32388)

Question 897197: what is the quotient of 4-i
2+5i written in standard form?
Click here to see answer by Fombitz(32388)

Question 897438: x^2+5x+8=0 solve in complex number system
Click here to see answer by Fombitz(32388)

Question 898203: Write each equation in slop-intercept form. X - 2y + 3 = 1.

Click here to see answer by Fombitz(32388)

Question 898191: Write the expression in the standard form a+ bi. 1/5-5i
Click here to see answer by Fombitz(32388)

Question 898238: Together, Steve and Top sold 99 raffle tickets for their school. Steve sold 15 more than three times as many raffle tickets as Tom. How many raffle tickets did each boy sell?
Click here to see answer by ewatrrr(24785)

Question 898350: Perform the indicated operations and write the result in standard form.
(-4 -sqrt(-5))^2
I get 8i sqrt(5), but mymathlab is telling me its wrong. My teacher has it set up so there is a limited amount of attempts so I need help for this. Thanks
Click here to see answer by josgarithmetic(39613)

Question 898458: Hello. I couldn't find any section for factoring trinomials so i chose this one.
i have one problem i am having trouble with.
this is it: a^2-14ab+24b^2
thank you
email: aisha21320@hotmail.com
Click here to see answer by Alan3354(69443)

Question 898528: (5-6i)-(7+4i)
Click here to see answer by jim_thompson5910(35256)

Question 898692: How do i writte the equation in the stanard form?
(2-3i)+(6+8i)
Click here to see answer by ewatrrr(24785)

Question 898802: please help me solve in the complex number system
x^2-3x+7=0
Click here to see answer by Alan3354(69443)

Question 898809: the piggy bank contained $25, and $1.50 is added each day
Click here to see answer by Alan3354(69443)

Question 899380: Please help me solve this (16i)^0.25
Click here to see answer by Fombitz(32388)

Question 899380: Please help me solve this (16i)^0.25
Click here to see answer by Edwin McCravy(20054)

Question 899329: show that the complex numbers have square roots and that the square roots are contained in the complex plane.What are the square roots of i?
Click here to see answer by Fombitz(32388)

Question 899409: Lashonda and her husband are each starting a saving plan. Lashonda will initially set aside
$125
and then add
$30.65
every week to the savings. The amount
A
(in dollars) saved this way is given by the function
=A+30.65N125
, where
N
is the number of weeks she has been saving.
Her husband will not set an initial amount aside but will add
$65.95
to the savings every week. The amount
B
(in dollars) saved using this plan is given by the function
=B65.95N
.
Let
T
be total amount (in dollars) saved using both plans combined. Write an equation relating
T
to
N
Simplify your answer as much as possible
Click here to see answer by ewatrrr(24785)

Question 899490: 9/8-I simplify into a+bi form
Click here to see answer by Fombitz(32388)

Question 899546: }

Click here to see answer by josgarithmetic(39613)

Older solutions: 1..45, 46..90, 91..135, 136..180, 181..225, 226..270, 271..315, 316..360, 361..405, 406..450, 451..495, 496..540, 541..585, 586..630, 631..675, 676..720, 721..765, 766..810, 811..855, 856..900, 901..945, 946..990, 991..1035, 1036..1080, 1081..1125, 1126..1170, 1171..1215, 1216..1260, 1261..1305, 1306..1350, 1351..1395, 1396..1440, 1441..1485, 1486..1530, 1531..1575, 1576..1620, 1621..1665, 1666..1710, 1711..1755, 1756..1800, 1801..1845, 1846..1890, 1891..1935, 1936..1980, 1981..2025, 2026..2070, 2071..2115, 2116..2160, 2161..2205, 2206..2250, 2251..2295, 2296..2340, 2341..2385, 2386..2430, 2431..2475, 2476..2520, 2521..2565, 2566..2610, 2611..2655, 2656..2700, 2701..2745, 2746..2790, 2791..2835, 2836..2880, 2881..2925, 2926..2970, 2971..3015, 3016..3060, 3061..3105, 3106..3150, 3151..3195, 3196..3240, 3241..3285, 3286..3330, 3331..3375, 3376..3420, 3421..3465, 3466..3510, 3511..3555, 3556..3600, 3601..3645, 3646..3690, 3691..3735, 3736..3780, 3781..3825, 3826..3870, 3871..3915, 3916..3960, 3961..4005, 4006..4050, 4051..4095, 4096..4140, 4141..4185, 4186..4230, 4231..4275, 4276..4320, 4321..4365, 4366..4410, 4411..4455, 4456..4500, 4501..4545, 4546..4590, 4591..4635, 4636..4680, 4681..4725, 4726..4770, 4771..4815, 4816..4860, 4861..4905, 4906..4950, 4951..4995, 4996..5040, 5041..5085, 5086..5130, 5131..5175, 5176..5220, 5221..5265, 5266..5310, 5311..5355, 5356..5400, 5401..5445, 5446..5490, 5491..5535, 5536..5580, 5581..5625, 5626..5670, 5671..5715, 5716..5760, 5761..5805, 5806..5850, 5851..5895, 5896..5940, 5941..5985, 5986..6030, 6031..6075, 6076..6120, 6121..6165, 6166..6210, 6211..6255, 6256..6300, 6301..6345, 6346..6390, 6391..6435, 6436..6480, 6481..6525, 6526..6570, 6571..6615, 6616..6660, 6661..6705, 6706..6750, 6751..6795, 6796..6840, 6841..6885, 6886..6930, 6931..6975, 6976..7020, 7021..7065, 7066..7110, 7111..7155, 7156..7200, 7201..7245, 7246..7290, 7291..7335, 7336..7380