Question

solve indefinite integral from -1 to 1 (1-x)dx?

Answer 1

First of all, as long as you asked to "solve integral from -1 to 1 " it's definite integral.
Integral(1-x)dx|_-1¹={x-x²/2}|_-1¹ =(1-1/2)-(-1-1/2)=1-1/2+1+1/2=2