we are given with two functions f(x)= x^2 and g(x) = -x^2. in this case, we can plot the first equation having a y with two values -x and x. On the other hand, in the second function, when we use the same values of x, the y-value is the negative of the y-value in used in the first equation. Hence the answer is 4)reflect the graph of f across the x axis.