Questions on Algebra: Complex Numbers answered by real tutors!

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Question 926740: express the reciprocal of -4 + √-50 in the form of (a+bi)?
express the reciprocal of 5i in the form of (a+bi)?

Click here to see answer by MathLover1(20849) About Me 

Question 927320: imaginary numbers
Click here to see answer by Alan3354(69443) About Me 

Question 929005: (2+i)(2-i)
Click here to see answer by Fombitz(32388) About Me 

Question 929378: How do you express square root of -4 +square root of -12 in terms of i?

Click here to see answer by ewatrrr(24785) About Me 
Question 929378: How do you express square root of -4 +square root of -12 in terms of i?

Click here to see answer by stanbon(75887) About Me 

Question 929777: Rounded to the nearest tenth, find the root of x^3-5x^2-12x+60=0 that lies between 3 and 4. Express your answer as a decimal.
Thanks for the help!

Click here to see answer by MathTherapy(10549) About Me 

Question 930626: Write the equation, in standard form, of a polynomial with real coefficients that has roots at 2, 1−2i, and 1+4i, and passes through the point (0,98).
Your answer should include only (decimal) numbers, the letter "x", and the characters "+", "-", and "^"
f(x)=___________

Click here to see answer by MathLover1(20849) About Me 

Question 930629: the complex fourth roots of -16? Leave answers in polar form with the argument in degrees.
Click here to see answer by Alan3354(69443) About Me 

Question 930942: Subtract:
-18 – (-9) =

Click here to see answer by MathLover1(20849) About Me 

Question 931106: 2 + 3i=
a) 13
b) square root of 13
c) 5
d) square root of 5

Click here to see answer by jim_thompson5910(35256) About Me 

Question 932083: FIND THE VALUES OF i^-i

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Question 932083: FIND THE VALUES OF i^-i

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Question 932135: |i|= ? , i= iota

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Question 932342: NEED TO WRITE A POLYNOMIAL FUNCTION OF LEAST DEGREE THAT HAS REAL COEFFICIENTS, THE GIVEN ZERO, AND LEADING COEFFICIENT OF 1. First problem gave me the zeros of 4, 2-3i
Click here to see answer by josgarithmetic(39613) About Me 

Question 932527: 《 is the square root since there is no square root button
Simplify
(《2 +《2)^2

Click here to see answer by richard1234(7193) About Me 

Question 932861: x=2+5i or x=2x-5i
Write a quadratic equation that has two solutions.
I believe I am supposed to FOIL this after I factor it, however I'm not quite sure of the process to get the answer to this question. Would I do (2x-5i)(2x+5i)? Or (x-2-5i)(x+2+5i)? Do I even need to do any of that?

Click here to see answer by josgarithmetic(39613) About Me 

Question 933412: How would you get "i" out of the denominator? Like in the problem 1+3i/2i
Click here to see answer by richard1234(7193) About Me 

Question 933537: 1. How to solve (-i)^-3.
2. Solve ( 1 + 1/i)^4

Click here to see answer by lwsshak3(11628) About Me 

Question 933635: (1+2i)/(3-4i)+(2-i)/5i


Click here to see answer by MathLover1(20849) About Me 
Question 933635: (1+2i)/(3-4i)+(2-i)/5i


Click here to see answer by Alan3354(69443) About Me 

Question 933624: I know how to do some of this problem but i need help.

The problem is Find the Zero of each Function
f(x)=x^2-6x+20

Click here to see answer by rothauserc(4718) About Me 

Question 934341: (x^3-8)/(x^2+x-6)x (x^2-9)/(x^2+2x+4)
Click here to see answer by MathLover1(20849) About Me 

Question 934356: (1/x-1)-(1/x+1)= x/x-1
Click here to see answer by Fombitz(32388) About Me 

Question 934755: Solve the following equations simultaneously:
4xy+x^-3xy^-y=-5
2y-3x-1=0

Click here to see answer by Alan3354(69443) About Me 

Question 935162: Solve by factoring:
x2+9x+20=0

Click here to see answer by mananth(16946) About Me 

Question 935390: 3+5i

Click here to see answer by Alan3354(69443) About Me 

Question 935628: Question 1
Z1=3+2j Z2=1+7j
A. Find Z1xZ2
B. Find Z1/Z2
Question 2
Convert Z1 and Z2 into polar and find the following
A. Find Z1xZ2
B. Find Z1/Z2
Please answer in as much detail as possible and show all working for both questions.
Thank you

Click here to see answer by Fombitz(32388) About Me 

Question 915479: z= (3+4i)(12-5i)/(2+i)
a. |z| ?
b. Re (z) and Im (z)?
I doubt !
thnx alot

Click here to see answer by tommyt3rd(5050) About Me 

Question 918061: Short response
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Question 915495: z= (3+4i)(12-5i) /(2+i)
a. |z| ?
b. Re (z) and Im (z)?
I doubt !
thnx alot

Click here to see answer by tommyt3rd(5050) About Me 

Question 933726: Factor completely: 3x^6-81
Click here to see answer by tommyt3rd(5050) About Me 

Question 914301: (z+1)/(z-1) = ki
show that z*zbar =1

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Question 936314: Simplify: a^2-16/a^2-a-12 / 4a+a^2/2a
Click here to see answer by Alan3354(69443) About Me 

Question 937666: find the complex conjugate of:
sqrt(5)-4i

Click here to see answer by TimothyLamb(4379) About Me 

Question 937672: Find complex conjugate and the product of conjugates, for: sqrt(5)-4i
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Question 937711: write the expression in the from a+bi, where a and b are real numbers.
(-6-sqrt(-18))/3

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Question 937723: write each expression in the form a+bi, where a and b are real numbers
-3i/(3-6i)

Click here to see answer by MathLover1(20849) About Me 

Question 937757: How come ((1-x)^-1)= 1+x+x^2 ?
quadratic solution of equation 1+x+x^2 is R⇔L -0.5.

Click here to see answer by josgarithmetic(39613) About Me 

Question 937818: Solve as x approaches 0 lim ((x-2)^3 + 8)/x
Click here to see answer by MathLover1(20849) About Me 
Question 937818: Solve as x approaches 0 lim ((x-2)^3 + 8)/x
Click here to see answer by rothauserc(4718) About Me 

Question 937883: Please solve -15+-16+-18+-6
Thank you.

Click here to see answer by Alan3354(69443) About Me 

Question 937988: I'm trying to figure out how to find "Complex Zeros of Quadratic Functions" but the Holt McDougal video lesson isn't helping whatsoever and I've researched as much as I could. I'm trying to find the zeros of "f(x)=x˛+2x+3" and the video says the answer is x=6+2i√3. This involves imaginary numbers.
Click here to see answer by nerdybill(7384) About Me 
Question 937988: I'm trying to figure out how to find "Complex Zeros of Quadratic Functions" but the Holt McDougal video lesson isn't helping whatsoever and I've researched as much as I could. I'm trying to find the zeros of "f(x)=x˛+2x+3" and the video says the answer is x=6+2i√3. This involves imaginary numbers.
Click here to see answer by josgarithmetic(39613) About Me 
Question 937988: I'm trying to figure out how to find "Complex Zeros of Quadratic Functions" but the Holt McDougal video lesson isn't helping whatsoever and I've researched as much as I could. I'm trying to find the zeros of "f(x)=x˛+2x+3" and the video says the answer is x=6+2i√3. This involves imaginary numbers.
Click here to see answer by MathTherapy(10549) About Me 

Question 938006: Find the quadratic equation with real coefficients for which 2+3i is a solution.
Click here to see answer by josgarithmetic(39613) About Me 

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