This is a simple enough question, well at least i assume it should be, but it's stumping me somewhat, how they've derived the answer that they put.
can someone walk me through it? I dunno where i may be going wrong... I've been practicing similar questions with ok enough luck but this one, i dunno..
The question reads as follows:
Given that y=x^3 - 12x, find the slope of the curve at the point P, where P = (1, -11). (Find the gradient of the secant slope)
This is a simple method, involving the change in y / the change in x, using the given point, and another point (x+h) and its corresponding y value (that would be calculated when (x+h) is substituted). I haven't done any differentiation or anything as yet...
And their answer is -9