solving polynomials: Factoring. HELPPPPPP!

[yulka]

solve for x.

a.) 2x^3-3x^2-5x+6=0
b.)8x^3+4x^2-18x-9=0
c.)2x^3+10x^2+13+5=0
d.) 3x^3+2x^2+75x-50=0

i dont get this, somebody please help me!!!

 

[wjm11]

solve for x.

a.) 2x^3-3x^2-5x+6=0
b.)8x^3+4x^2-18x-9=0
c.)2x^3+10x^2+13+5=0
d.) 3x^3+2x^2+75x-50=0

i dont get this, somebody please help me!!!

Great tutorial here:

http://www.purplemath.com/modules/solvpoly.htm

Also, if you graph these, you'll find the curve crosses the x-axis at 1 - 3 places (since they are cubic equations); the places it crosses the x-axis are the real number solutions.