If f (x) = (A-2) x & # 178; + (A-1) x + 3 is an even number, find the value of real number a? Find the monotone increasing interval of function f (x)?

If f (x) = (A-2) x & # 178; + (A-1) x + 3 is an even number, find the value of real number a? Find the monotone increasing interval of function f (x)?

Let's say it's an even function, f (x) = f (- x), so a = 1
Monotone increasing interval: when a > 2, x > 0; when a > 2, x > 0