Questions on Algebra: Complex Numbers answered by real tutors!

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Question 24680: I AM SUPOSED TO USE i for this but the teacher did not explain how
x^2=-16
8x^2=-2
x^2=-30
please help
thank you for your time
Click here to see answer by josmiceli(9686)

Question 24963: x^2+1=-8 solve
4x^2+8=0
graph
y=x^2-1
y=2x^2
Click here to see answer by quentin252(19)

Question 25049: how do u solve x squared +7x-1 equals 0
Click here to see answer by stanbon(57361)

Question 25400: Please help me solve this algebra 2 question:
The Absolute value of 5-4i
Click here to see answer by venugopalramana(3286)

Question 25593: PLEASE HELP ME SOLVE THIS PROBLEM. (x2+5) = x+3 The answer is -2/3 but I don't know how to arrive at this. I worked for several hours on this but had no luck.
Click here to see answer by AnlytcPhil(1277)

Question 25762: Can you please help me with this, we are doing differential Calculus.
Find the equation of the tangetn for each given x-value.
y=x^2+8x+12, where x = -4.
At the back of the book, it says the answer is y=-4
I have no idea how to get that.
thank you.
Click here to see answer by josmiceli(9686)

Question 25761: Can you please help me with this, we are doing differential Calculus.
Find the equation of the tangetn for each given x-value.
y=x^2+8x+12, where x = -4.
At the back of the book, it says the answer is y=-4
I have no idea how to get that.
thank you.
Click here to see answer by venugopalramana(3286)

Question 26063: (4-i)+ (5-9i)
Click here to see answer by stanbon(57361)

Question 26073: simplify
(2-4i)/(1+3i)
Click here to see answer by AnlytcPhil(1277)

Question 26058: ok, i just DONT understand imaginary numbers in problems! i really need help! heres a problem: 7i^3 + 8i^12 +9i^17 -5i^16 = ?
PLEASE HELP! i dont know what to do with the numbers in front...!!!
Click here to see answer by venugopalramana(3286)

Question 26352: A regular octagon is inscribed in a circle of radius 15.8 cm. Find the perimeter of the octagon.
What is the angle of elevation of the sun when a 35-ft mast casts a 20-ft shadow

Click here to see answer by uknouluvme89(30)

Question 26351: A regular octagon is inscribed in a circle of radius 15.8 cm. Find the perimeter of the octagon.
What is the angle of elevation of the sun when a 35-ft mast casts a 20-ft sha

Click here to see answer by stanbon(57361)

Question 26440: -6 to 2nd power
Click here to see answer by Kittycat5604(1)

Question 26439: -6 to 2nd power
Click here to see answer by ellygirl5969(8)

Question 26442: (-3)2 to 2nd power + 4 to 2nd power -1=
Click here to see answer by Alwayscheerful(414)

Question 26242: How do i show for integers m and n and a natural number k that is greator and equal to 1.
m divides n right arrow m divides n^(k).
Click here to see answer by venugopalramana(3286)

Question 26571: What does the complex number i^3 equal?

Click here to see answer by longjonsilver(2297)

Question 26713: what is slope of y=3x+9
Click here to see answer by longjonsilver(2297)

Question 26756: what is i to the 235th power
Click here to see answer by whty89(20)

Question 26756: what is i to the 235th power
Click here to see answer by bmauger(101)

Question 27035: Between 1970 and 1990, the population of Buffalo, New York, decreased at the rate or 0.82% per year. The population, P, in year t is given by

where t=0 corresponds to 1980. Find the population in 1970.
Click here to see answer by mbarugel(146)

Question 27081: x^4=1
Click here to see answer by elima(1433)

Question 27317: Find the multiplicative inverse of each complex number. 4-2i
Click here to see answer by bmauger(101)

Question 27318: Can you help me find the multiplicative inverse?8-2i
Click here to see answer by sdmmadam@yahoo.com(530)

Question 27472: 5x^2+18x+1=0
Click here to see answer by stanbon(57361)

Question 27616: Is the square root of plus or minus 5 (where the plus and minus are in front of the square root sign) the same thing as 5i and -5i ?
If not what does 5i and -5i really mean?
Click here to see answer by venugopalramana(3286)

Question 27172: I am trying to find out if these are true:

and

I can verify

and

The following should be true, but I can't seem to prove it

I run into a sign problem- keep getting +1 = -1
Thanks for your help
Click here to see answer by venugopalramana(3286)

Question 28088: What is the square root of i? Also what is the sq. root of -i?
Click here to see answer by longjonsilver(2297)

Question 28032: What is the minimum value of the expression modulus( a + b*w + c*w^2)
where w & w^2 are complex cube roots of unity and a, b, c are constants which are not all equal?
Click here to see answer by venugopalramana(3286)

Question 28109: I want to know the answer to the problem of 8u=3u+35, can you show me

Click here to see answer by sdmmadam@yahoo.com(530)

Question 28112: solve 2x+48=10x
Click here to see answer by sdmmadam@yahoo.com(530)

Question 28710: I am having trouble solving this problem
cube root of (9y/2x)
thanks for your help
Click here to see answer by longjonsilver(2297)

Question 28709: I am trying to solve (7(sqare root of x) +3)times(2(square root of x) -6)

Click here to see answer by longjonsilver(2297)

Question 28613: The sum of the first n terms of a arithmetic sequence is ginen by 2n+3n^2. Find the 10th term of the seuqence.
Click here to see answer by venugopalramana(3286)

Question 28721: I am also having a tough time with this problem
negative square root of (-200x squared)
Click here to see answer by josmiceli(9686)

Question 28750: 9x^2+30x+25=11

Click here to see answer by sdmmadam@yahoo.com(530)

Question 28839: Simplify:
First Question:
i^2522

Second Question:
16/2i
Click here to see answer by sdmmadam@yahoo.com(530)

Question 28876: -2x squared + 10x = 15
Click here to see answer by sdmmadam@yahoo.com(530)

Question 29190: Please help me simplfy the following complex fraction:
(3/(2+x)-4/(2-x))/(1/(x+2)-3/(x-2))
I am having trouble with the method. The method I was using I came up with
(-7x-2(x-2))/((2-x)-2x-8). When I checked with the solver on this web site I came up with something totally different.
Click here to see answer by longjonsilver(2297)

Question 29244: sixth root of (-1+sqrt3i)^3
Click here to see answer by sdmmadam@yahoo.com(530)

Question 29384: I think this is the right section, I have a question that's been bothering me for a while. Here it is:
The college bookstore sells three types of graphing calculators (GC1, GC2, and GC3). They have a total of 40 calculators to sell. The total amount of revenue (exclude tax) that the bookstore would receive is $3,590. The lowest price calculator, GC1, is $75 less than the most expensive type GC3. Find the price of each type of calculator.
I tried to do it in a three variable system, like I'm supposed to, but I'm having trouble coming up with the third equation. I got A + B + C = 40 and A = C - 75, but I can't get the other one. Please help.
Click here to see answer by Nate(3500)

Question 29449: Find the real numbers a and b such that:
((5i)/(2+3i)^2)=a+bi
Find the real numbers a and b such that:
((1+i)/i)-((3)/(4-i))=a+bi
Click here to see answer by longjonsilver(2297)

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