SOLUTION: find all the solutions to the equation -2x^3 -3x^2 +5x+6=0 The answer given is -2.0, -1.0, 1.5 but I do not understand how they found those solutions

Algebra.Com
Question 852954: find all the solutions to the equation -2x^3 -3x^2 +5x+6=0
The answer given is -2.0, -1.0, 1.5 but I do not understand how they found those solutions

Answer by ewatrrr(24785)   (Show Source): You can put this solution on YOUR website!
 
Hi,
-2x^3 -3x^2 +5x+6=0 |Find one root by trial and error: x = 1 NO, x = -1 YES!!
Using that root to find others with Synthetic Division:
-2 -3 5 6

2 1 -6
-2 -1 6 0
= (-2x^2 -x + 6) = 0
(-2x^2 -x + 6) = 0 Factor
(-2x +3)(x +2)= 0
(-2x +3)= 0, x = 3/2
(x +2)= 0, x = -2
Roots: x = -2, -1, 1.5

RELATED QUESTIONS

Find all solutions to the equation... (answered by stanbon)
It is a multiple choice question: Which one of the following equations represents a line... (answered by lynnlo)
A. Solve the following quadratic equations. Make sure to show all your work. Do not use... (answered by checkley71)
decide all values of b in the following equations that will give one or more real number... (answered by josmiceli)
Please help I need to know do these Quadriac Equations have a solution or not. And how to (answered by stanbon)
use the discriminant to determine the number of solutions of the quadratic equation, and... (answered by stanbon,AnlytcPhil)
I want to find all solutions of this equation. 2 sin x + square root of 3 = 0 I... (answered by longjonsilver)
Find all solutions to the equation: 2sin^2x + 3sinx + 1=0?? This is how I attempted to... (answered by Alan3354)
I am struggling with Algebra and quadratic equations. I do not understand how to solve... (answered by Earlsdon)