There are 9 terms in the expansion, each one is of this form:

, where k goes from 0 through 8

 Simplifying











Subtract exponents of x



Simplifying:





The only time x raised to a power is NOT a variable, but a
constant, is when the exponent of the power is 0, since x0 = 1,
and 1 is a constant, not a variable.


Therefore we take the exponent of x, which is 8k-24, and set it
 equal to 0:

8k-24 = 0
   8k = 24
    k = 3

So we substitute k = 3 in

















Edwin

There are 9 terms in the expansion, each one is of this form:

, where k goes from 0 through 8

 Simplifying











Subtract exponents of x



Simplifying:





The only time x raised to a power is NOT a variable, but a
constant, is when the exponent of the power is 0, since x0 = 1,
and 1 is a constant, not a variable.


Therefore we take the exponent of x, which is 8k-24, and set it
 equal to 0:

8k-24 = 0
   8k = 24
    k = 3

So we substitute k = 3 in



















Edwin