Algebra Polynomials

Question

Evaluate the Polynomial for x=3 and for x=-3

 

2x^3 - 1/9 x^2

Answer 1

Hello, thank you for taking the time to post your question!

In each case you just want to plug in the given value of x and then evaluate.

When I do that for x = 3 I get

2(3)^3 – 1/9(3)^2

=2(27) – 1/9(9)

=54 – 1

=53

Then for x = -3 it should be

2(-3)^3 – 1/9(-3)^2

=2(-27) – 1/9(9)

=-54 – 1

= -55

I hope that helps get you moving in the right direction! Feel free to reach out if you have any additional questions beyond that :)

Answer 2

For x=3

 

2x^3-1/9x^2

= 54-1/9*9

=53

 

For x=-3

 

2x^3-1/9x^2

 

-54-1=-55