Answer
See below
Work Step by Step
The binomial expression can always be rewritten as the following.
$(A+B)^n = \sum _{k=0}^n C(n,r)* A^{n-r} * B^{r}$
Since we are finding the first 3 terms, we simply plug in the set $[0,1,2]$
$T_1 =C(8,0)*x^8 =x^8 $
$T_2 = C(8,1)*x^7*2=16x^7$
$T_3 =C(8,2)*x^6*2^2= 112x^6$
