Please walk me through every step for solving 1, 4, and 5

Calculus Section 3.1 - The Derivative of a Function Assigned Problems or # 1 - 4, use the definition f'(x) = lim/(xth)-f(x) to find the derivative of h he given function at the given value of x. f ( x ) =-, at x=2 X . f(x) = x'+4, at x=1 . f(x) = 3-x, at x=-1 . f (x) =x+x, at x=0 For # 5 - 8, use the definition f'(x) = lim J(x)-f(a) to find the derivative of x ->a x - a given function at the given value of x. 5. f(x)=-, at x=2