What is the difference between adding and subtracting? ? /

What is the inverse of the function f(x) = 2x + 1?

Prove that 16^4-2^13-4^5 is divisible by 11.

Suppose that the function f is defined. , for all real numbers, as follows. _ \ 1/4x² -4 if x≠ -2 f(x)=< /_-1 if x=-2 find f(-5), f(-2), and f(4)