Question

The slope of the tangent to the curve f(x)= x^3 + x at any point can be given by the expression
1. 3x^2
2. 3x^2 + 1
3. x^3+1
4. x^3

Answer 1

d/dx (x^n) = n x^(n-1)
so
3 x^2 + 1 x^0 = 3 x^2 + 1