fredurst89 wrote:
Hi,
I resolved this question assuming that a function that satisfies F(x)=F(X^2) for all x is a constant function. Am I correct?
This is was my first thought too (thinking about constant 0,1 output) but it's not necessarily the case that it's a constant. It could be some expression, but it's easier to conceptualize with a constant.
If we test x=0,1 we can see that several answers work, if we test x=10 we can see only B) works:
A) 10 = 10 * 10
B) 10 - 10 = 0C) 10 + 10 = 0
D) 10 = 3 * 10
E) 10 = 0
The point is to understand that given the square in 2nd function, f(-2) = f(4) = f(16)
Bunuel chetan2u is the above reasoning correct?Takeaway: when given functions without expressions, just plug (and re-plug) numbers to see what works