Sunday

December 21, 2014

December 21, 2014

Posted by **Zac** on Monday, January 10, 2011 at 12:11pm.

- algebra -
**Reiny**, Monday, January 10, 2011 at 12:26pmverify that you meant

x^3 + 8x^2 + 6 = 0

- algebra -
**Zac**, Monday, January 10, 2011 at 12:30pmx3 + 8x2-x-6 = 0?

- algebra -
**Reiny**, Monday, January 10, 2011 at 12:38pmx^3 + 8x^2 - x - 6 = 0

Let f(x) = x^3 + 8x^2 - x - 6

f(1) = 1+8-1-6 ≠ 0

f(-1) = -1 + 8 + 1 - 6 ≠ 0

f(2) = 8 + 32 - 2 - 6 ≠ 0

f(-2) = -8 + 32 + 2 - 6 ≠ 0

f(3) = 27 + .... ≠ 0

f(-3) = -27 + 72 ... ≠ 0

numbers which are NOT possible rational roots are

±1 , ±2 , ± 3

Is that what you wanted?

- algebra -
**Zac**, Monday, January 10, 2011 at 12:42pmyeh but my homework has +-2 and +-1 as answers abd i can only choose one

- algebra -
**Reiny**, Monday, January 10, 2011 at 12:46pmI used the 1 , 2, and 3 since they were factors of the 6 at the end.

There are an infinite number of choices of rational numbers which are NOT possible roots.

This is a poorly worded question.

go with the ±1 and ±2

**Answer this Question**

**Related Questions**

algebra - use the rational root theorem to list the possible rational roots for ...

ALGEBRA - SIMPLIFY: 5 ROOT OF 6X +4 ROOT OF 6X IS THE ROOT OF 77 IRRATIONAL OR ...

algebra - using the rational root theorem to list all possible rational roots of...

ALGEBRA 2 - Use the Rational Root Theorem to list all possible rational roots ...

Math - Find all possible rational roots using the rational root theorem. x^4 - ...

Pre-Calc-Please check - Is this correct? Using Rational Roots Theorem, list all...

math - List all possible rational zeros of... h(x)= 2x to the (4th power) - 5x (...

Algebra 2 - Use the rational root theorem to determine which of the following ...

math - I HAVE THESE ANSWERS FOR THE PROBLEMS. COULD YOU DOUBLE CHECK PLEASE, ...

Pre-Calc-Please check - I have three questions: 1. What is the remainder of (x^3...