# Math 209

posted by .

f(x) = x3 + 2x2 – 0.4X – 1

how do you you factor this?

• Math 209 -

Do not repost a question which has been answered.

http://www.jiskha.com/display.cgi?id=1276043019

• Math 209 -

There is no simpl standard formula for finding the roots of cubic equations. First create integer coefficients by rewriting as
(1/5) (5x^3 + 10x^2 -2x -5)

There are no simple factors with integers for this equation. That can be proven with something sometimes called the "p/q theorem". It can be faotored to
f(x) = 5[(x-0.689)(x+1.941,(x+0.748)]
I used an online solver for that.
The numbers in the factors are rounded.

## Similar Questions

1. ### algebra

this is what u do on your first problem....first u take out the greatest common factor that would go into all of them... 4n^2-20n+24...now what number will go into all of them...well 4 will...4 will go into 4,20,and 24...so. it would …
2. ### Math 209

When simplifying a rational fraction, why do you need to factor the numerator and the denominator?
3. ### Factor

How do I factor these: 2x2 - 16x + 30 4x^2-9 x^2-5x 5x^2-26x+5 25x^2+4 Example: 2x^2 - 16x + 30 = 2 (x^2 - 8 x + 15) 2(x - 5)(x - 3) The first, factor out a 2 first. Then factor . The second...difference of two squares Third factor …
4. ### math

i need to factor 2x²-x-6
5. ### Math

factor 2x2 - x - 3
6. ### Math 209-College Mathematics II

How do you factor this completely: x^3 + ax + 3a + 3x^2
7. ### Math 209

f(x) = x3 + 2x2 – 0.4X – 1 how do you you factor this?
8. ### Algebra

Solve. (–10x3 + 30x – 20) ÷ (–5x + 5) • 2x2 – 2x + 4 • –2x2 – 2x – 4 • –2x2 + 2x + 4 • 2x2 + 2x – 4 How?
9. ### math

help on this please? Factor completely 2x2 - 2x - 24. (2x - 6)(x + 4) (2x - 8)(x + 3) 2(x - 3)(x + 4) 2(x - 4)(x + 3)
10. ### math

What is the value of t in the equation below?

More Similar Questions