
check your calculator for the [!] factorial button.
also bear in mind that most calculators also have an [ₙPᵣ] button, to get Permuations, and you can just use that.
The answer is 4.
x =-3 y= 1
-3 x 1= -3 and (-3)^2 + (1)^1 = 10
if u plug in -3 into the x and 1 into the y you get 4.