Thursday

November 20, 2014

November 20, 2014

Posted by **anon** on Thursday, December 8, 2011 at 4:51pm.

3x^3 - 20x^2 + 29x +12 = 0

Ok I thought I knew how to do this but I guess I don't. Help me! Please!

- college alegebra -
**Steve**, Thursday, December 8, 2011 at 5:04pmA general cubic is hard to solve. So, expect an easy root first. Any rational root of the form a/b will be such that a divides 12 and b divides 3

A little synthetic division will show that

3x^3 - 20x^2 + 29x +12

= (x-3)(3x^2 - 11x - 4)

= (x-3)(x-4)(3x+1)

SO, knowing the factors, you should have no trouble finding the roots . . .

- college alegebra -
**anon**, Thursday, December 8, 2011 at 5:16pmThank you that helps a lot!

**Answer this Question**

**Related Questions**

Math - factor each expression completely. if possible. Just checkin the * Ones 1...

Math - Real number system - Solve the following equation in the real number ...

college algebra - Solve the following equation in the real number system. Please...

college algebra--need help please!! - solve the equation in the real number ...

alegebra - solve the sytem of equation by graphing. Then classify the system as ...

Pre-algebra - Solve. 29x – 2(9x – 0.455) = 10x + 0.525 Give us you thinking on ...

pre calculus - Ok not sure if it's just me with a block solve the following ...

College Algebra - Solve the following equation in the complex number system x^4+...

College Algebra - Solve the following equation in the complex number system x^4+...

alegebra - Solve the system of equations by graphing. Then classift the system ...