Find gradient of a curve?

Question

find gradient of curve

y = 3^3 - 4x +3

when x=2

and x =-1

i know that you have to differentiate first but i dont know what to do after that

thankyou

Answer 1

You have to only evaluate your differentiated function:

f'(x) = -4

You will notice that gradient is always -4

If your function was supposed to be:

x^3-4x+3 then:

f'(x) = 3*x^2-4

f'(-1) = -1

f'(2) = 8