Posted by chirag on Tuesday, February 12, 2013 at 9:41am.
x is a number such that x2+3x+9=0. What is the value of x3?

maths  Steve, Tuesday, February 12, 2013 at 10:15am
since (x3)(x^2+3x+9) = x^3  3^3
x^3  3^3 = 0
x^3 = 27

WoW at Steve  maths  Reiny, Tuesday, February 12, 2013 at 11:52am
What a great way to do this question.
Did you see the roundabout way I used ??
http://www.jiskha.com/display.cgi?id=1360597831
I was even thinking of using DeMoivre's theorem.

WoW at Reiny  maths  Steve, Tuesday, February 12, 2013 at 4:07pm
I was going to show an alternative direct solution, but when I saw where it was headed, I blew it off.
Can't believe you
(a) slogged through it all
(b) got it right!
Answer This Question
Related Questions
 maths  N is an even 3digit number such that the last 3 digits of N*N are N ...
 maths  The function f is such that f(x)= (2  x)^2, x belongs to real number. ...
 Maths question  (a) find the largest four digit number which has a total of ...
 Maths  (a) find d largest four digit number which has a total of exactly 3 ...
 maths  Ramesh buys 150 shares of par value ` 10/ each of a company which pays ...
 Maths  I have a three digit number such that the sum of the cubes of each digit...
 maths  find value of p such that the equation (x+1)(x+2)=p
 Maths  Find the two digit number such that if you treble it and you take away ...
 Maths  If P and Q are two integers such that `P' is the predecessor of Q, what ...
 applied maths  find the value of b such that u=(2,4,2) ¡ì v=(b,b^2,1) are ...
More Related Questions