Given the function f (x) = 4x * 2 -- KX 8, if the function is an even function on R, find the value of the real number K

Given the function f (x) = 4x * 2 -- KX 8, if the function is an even function on R, find the value of the real number K

Hehe, even functions are symmetric about the y-axis, f (x) = f (- x). If you bring X and - x into the function, you can calculate the value of K
I'm not sure what your function is
The general rule is as follows:
In the even function, the coefficient of the odd degree of X (such as the first term and the third term of x) is 0;
In odd function, the coefficient of even degree of X (such as quadratic term and quartic term of x) is 0