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(10,0)*x^{10} =x^{10} $
$T_2 = C(10,1)*x^9*(-2)=-20x^9$
$T_3 =C(10,2)*x^8*4= 180x^8$
