calculus
posted by Branden on .
Find the instantaneous rate of change of y with respect to x when x = 15 for the function y = 5x2 − 2x

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