Math
posted by plsHelp .
Find the intervals which proves that function is upward/increase.
a) f(x)=1x2
b) f(x)=x22x

f(x) is increasing if f'(x) > 0
I'll do (a)
f'(x) = 2x
f'(x) > 0 when x < 0
The graph is a parabola with vertex at (0,1) which opens downward.