Posted by **Claure** on Tuesday, June 16, 2009 at 7:57pm.

f(x)=x^3-4x^2-x+4

How do I find the x-intercept for this?

This is from my book:

step 1: 0=x^3-4x^2-x+4

step 2: 0=x^2(x-4)+(-1)(x-4)

step 3: 0=(x^2-1)(x-4)

I know how to solve once I get to step 3, but in step 2, I don't know what they've done or why. Where does that (-1) come from? Why is it (x-4)?

Please help explain this to me. I'd be really thankful.

## Answer This Question

## Related Questions

- ALGEBRA HELP - When solving the equation, what property was used to go from step...
- pre algebra - solve the equation step by step.list each step along with the ...
- Algebra 1--Step-by-Step - Can someone show me how to solve these step-by-step? ...
- Quick math help - In which step below does a mistake first appear in simplifying...
- algerbra - solve the equation step by step list each step along with the ...
- algebra 1 - ELEMENTARY ALGEBRA #3 Page 23 Chapter 3 Lesson 3.02 Solving Multi-...
- Chemistry - In a chain mechanism, a reaction in which two free radicals combine ...
- Algebra - Debbie finished her algebra test early so she decided to check each of...
- Algebra - How do I solve for the elimination method: 5x + 3y= -7 and 7x - 2y =13...
- Math - Find the value of the following expression: (2^8 x 5^-5 x 19^0)^-2 x (5^-...

More Related Questions