1m & gt； O function monotonically increases

It is proved that the linear function m>0 and X belong to R, so the function image is in the first and third quadrants, that is, monotonically increasing.

M<0 function monotonically decreases.

Prove the linear function m

2 y=X2+X

3. Because f(X) is an even function, the symmetry about y is increasing function at (-oo, 0).