plz solve this and show all your work
x^2+28/x=11
please show all your steps..dont make it confusing!!
2007-06-14 04:59:21 · 9 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics
U SOLVE FOR x...A DUH!!!
2007-06-14 05:07:21 · update #1
The A DUH part wasent for u so i dont know why u r whining!!!..and i am being nice..
2007-06-14 05:14:32 · update #2
wats ur problem dungna..i wasent talking to u..ur not at my level
2007-06-14 10:00:04 · update #3
Multiplying both sides by x, we get
x^3 + 28 = 11x, so that =x^3 + 28 - 11x = 0, an equation of degree 3. There's no formula to solve such equation, but since its degree is odd, we know it has at least 1 real root. n. By means of an Excel spreadsheet, I got a real root x1 =~ -4.202671173
To find the other roots, you do a long division, divide the polynomial x^3 - 11x + 28 by the binomial x + 4.202671173. Then, you'll get a polynomial of degree 2. The other roots, real or not, are then easily found using Bhaskara formula.
2007-06-14 05:12:00 · answer #1 · answered by Steiner 7 · 1⤊ 2⤋
There is a method, but it is quite lengthy. Check out Cardano's method. This will give you at least one real root. This method has some other names.
http://en.wikipedia.org/wiki/Cardan_formula#Cardano.27s_method
It will yeild the solution found above. You will have to do some more algebra to arrive at the complex roots. I did the algebra and came up with these three solutions
x = -4.203, 8.833 + j(2.999), 8.833 - j(2.999)
The numbers are clearly rounded, though the complex roots look like they could be rational, but I haven't checked the algebra that closely.
I apologize for not showing it all here. Email me and I will send you the complete solution.
2007-06-14 06:16:10 · answer #2 · answered by joe_ska 3 · 0⤊ 0⤋
Hi, well your the one that needs help and its your work. If you were not rude I would solve it but, hey a little kindness goes a LONG way. No your not, being nice at all. I can see it when you typeed this, no thoughts of kindness. Your just rude!
2007-06-14 05:10:48 · answer #3 · answered by Dogna M 4 · 1⤊ 1⤋
hi there, first open up the paranthesis on the left area 3(5x-2) = 15x - 6 now you've 15x - 6 < x + 8 placed the words with x on the left hand area and variety on the righthand area and function 15x - x < 8 + 6 14x < 14 x < a million the answer: x < a million
2016-11-23 20:56:39 · answer #4 · answered by ? 4 · 0⤊ 0⤋
x^2+28/x=11
You bring the 28 over to the 11 side and turn the + to a -
so it would be 11-28 and that will =-17
x^2/x=-17
And That's the answer. I might be in a different math class though.
2007-06-14 05:14:43 · answer #5 · answered by Jesus's Little Helper 2 · 0⤊ 4⤋
x^2 + 28/x = 11
11 * 28 = 318
x^2 = 318
x = 17.?
2007-06-14 05:19:45 · answer #6 · answered by Anonymous · 0⤊ 4⤋
SOLVE
This is an extremely easy problem, you should be able to do this on your own using logic.
2007-06-14 05:02:57 · answer #7 · answered by Anonymous · 2⤊ 1⤋
I would solve it for you and your homework, but, unfortunately, you did not say what it is that we are solving FOR, are we to solve for X?
2007-06-14 05:06:07 · answer #8 · answered by Anonymous · 2⤊ 1⤋
Ummm... the "A DUH" was pretty rude for a girl that can't do a simple math problem.
2007-06-14 05:11:39 · answer #9 · answered by C-Wryte 3 · 2⤊ 1⤋