# need help to understand how to solve!

• Nov 5th 2012, 10:35 AM
impressu2
need help to understand how to solve!
Consider the function below.g(x) = x4 - x3 + x2 - x
Find g(-14).
• Nov 5th 2012, 10:41 AM
fkf
Re: need help to understand how to solve!
Quote:

Originally Posted by impressu2
Consider the function below.g(x) = x4 - x3 + x2 - x
Find g(-14).

If we have defined a function to be f(x) = x^4-x^3+x^2-x then we want to find g(-14)

f(x) = x^4-x^3+x^2-x => g(-14) = (-14)^4-(-14)^3+(-14)^2-(-14) = 41370
• Nov 5th 2012, 10:43 AM
impressu2
Re: need help to understand how to solve!
Thank you!
• Nov 5th 2012, 10:46 AM
$\left g(x)=x^4-x^3+x^2-x=x^3(x-1)+x(x-1)=(x-1)(x^3+x)=(-14-1)(-14^3-14)=-15(-2744-14)=41370$.