college math
posted by Amber .
prove f(x)= x^15+6 is increasing on the interval: I= (‡,‡)

find the derivative:
f'= 15x^14
this function is always positive (graph if you don't believe me) because any number to an even power must be 0 or greater.
thus since the derivative is always positive, the graph of f (x) is always increasing
:P