Posted by Branden on Tuesday, August 23, 2011 at 12:58pm.
Find the instantaneous rate of change of y with respect to x when x = 15 for the function y = 5x2 − 2x

calculus  Reiny, Tuesday, August 23, 2011 at 1:00pm
I think you meant to type
y = 5x^2  2x
if so, then
dy/dx = 10x  2
and if x = 15
dy/dx = 10(15)  2 = 148