PreCalculus
posted by Ashley .
Hello, I have tried solving this using the rational roots theorem and none of the roots seem to be working. I'm trying to figure out where I went wrong.
3x^3 2x^2  7x  4 = 0

PreCalculus 
Reiny
you are right, it does not factor over the rational numbers.
here is a webpage that solves cubics for you, just enter the constants
it gave me 1 irrational root and 2 complex roots. 
PreCalculus 
Ashley
Thanks for the help. However, I don't see the webpage you were speaking of.

PreCalculus 
Reiny
how silly of me
http://www.1728.com/cubic.htm 
PreCalculus 
Ashley
Thanks!
Respond to this Question
Similar Questions

Math
Roots Ok, what about roots? Roots of polynomials? 
Math
How to factor x^3  3x^2 + 4 =0 Use D'Alembert's Rational Roots Theorem. Any rational roots of the form of p/q (p and q assumed to be relatively prime) must be such that p divides the constant term (in this case 4) and q divides the … 
Pre Calc
Write a quartic function that has roots that are 3+5i, 4 and 7 and f(3)=53. I have tried it a bunch of times and can't seem to get it. (x3+5i)(x35i)(x+4)(x7) I multiplied them together x^49x^3+24x^2+66x952 I was a little unsure … 
PreCalcPlease check
I have three questions: 1. What is the remainder of (x^3 + 2x^2  5x+4) /(x3) I think the answer is 34? 
PreCalcPlease check
Is this correct? Using Rational Roots Theorem, list all possible rational root of f(x) = 2x^3  3x^2 + 5x+6 Possible roots are p/a = +1, +2, +3, +6. +3/2 
ALGEBRA 2
Use the Rational Root Theorem to list all possible rational roots for each equation. Then find any actual roots. x^3 + 2x^2 + 3x + 6 = 0 (8 points) 
algebra
using the rational root theorem to list all possible rational roots of the polynomial equation x^3x^2x3=0 possible answers 3,1,1,3 1,3 33 no roots 
precalculus
partial fraction; use the rational roots theorem to factor denominator. x^3 + 2  x^4 +8x^2 +16 i got to that and im stuck Ax+B + Cx+D   x^2 +4 x^2 + 4 
Pre Calculus
So I only have 3 homework questions left and I can't seem to figure out how to solve. I've tried solving them, but I keep getting them wrong. Any help? 
algebra
3x^4 + 5x^2  2 = 0 give imaginary and real roots rational roots theorem factors of (+)p/q are possible rational zeros of function f where the coefficients of f are integers. how do you go about solving this?