How do you use the definition to find the derivative of 3x^2-5x+23x25x+2?

1 Answer
Oct 15, 2015

6x-56x5

Explanation:

Let f(x)=3x^2-5x+2f(x)=3x25x+2

Then f'(x)= lim_(h->0)(f(x+h)-f(x))/h

=lim_(h->0)((3(x+h)^2-5(x+h)+2)-(3x^2-5x+2))/h

=lim_(h->0)(3x^2+6xh+3h^2-5x-5h+2-3x^2+5x-2)/h

=lim_(h->0)(h(6x+3h-5))/h

=6x-5