Friday

November 28, 2014

November 28, 2014

Posted by **Aoi** on Monday, June 15, 2009 at 10:19am.

okay, this is what i did:

-x^3 + bx^2 + cx + d = (x-1)(x-2)(x-k)

f(3)=8

-x^3 + bx^2 +cx +d = (x-1)(x^2-kx-2x+2k)

and im stuck...

is my interpretation of the question correct? when the questions states that the coefficient of x^3 is -1, it means the polynomial is something like -x^3 + ax^2 + bx + c right???

- POLYNOMIALS -
**Reiny**, Monday, June 15, 2009 at 1:39pmdon't expand it.

let f(x) = -(x-1)(x-2)(x-k)

it should be clear that if we would expand the right side, the first term would be -x^3

given f(3) = 8 , so ...

-(2)(1)(3-k) = 9

-2(3-k) = 8

-6 + 3k = 8

3k = 15

k = 5

- POLYNOMIALS -
**Aoi**, Monday, June 15, 2009 at 10:11pmThere's a bit of calculation mistakes there, but thanks, i know how to do it now!!!! XD

**Answer this Question**

**Related Questions**

POLYNOMIALS - ok, this might be a bit torturous, but if anyone is patient enough...

math - For every positive integer n, consider all monic polynomials f(x) with ...

Cubic Equations - I have three that I need help with if possible. 1. Solve 2x^3...

math - Still looking at how to solve these... Both are cubic polynomials? 43x^3...

Calculus II - Fed loves polynomials with rational coefficients and only such ...

Algebra2 - Find the polynomials roots to each of the following problems: #1) x^2...

algebra - Factor this polynomial: F(x)=x^3-x^2-4x+4 Try to find the rational ...

math - True or False? 1. The product of 2 linear polynomials is quadratic 2. ...

algebra question - Give an example of a polynomial with degree 3 such that when ...

Math - Roots Ok, what about roots? Roots of polynomials? Square roots? Cube ...