Question

Let f(x)=5x^2+4x+11 Then according to the definition of derivative f′(−8) is the limit as x tends to _________ of the expression _______. The value of this limit is ____

Answer 1

I know the value is -76 and the derivative is 10x + 4, but I don't know what those first two blanks are asking.

Answer 2

okay so tends to was -8, but what is the second blank asking for?

Answer 3

I assume it would be the derivative of the original function, but that isn't it.