Question 454857

Evaluate each polynomial for {{{x=3}}} and for {{{x= -3}}}.


for {{{x=3}}}:

 {{{(1/3)x^4 - 2x^3}}}

={{{(1/3)3^4 - 2*3^3}}}

={{{(1/3)81 - 2*27}}}

={{{81/3 - 54}}}

={{{27 - 54}}}

={{{-27}}}

for {{{x=-3}}}:

 {{{(1/3)x^4 - 2x^3}}}

={{{(1/3)(-3)^4 - 2*(-3)^3}}}

={{{(1/3)81 - 2*(-27)}}}

={{{81/3 + 54}}}

={{{27 + 54}}}

={{{81}}}