Given f(x)=4x - x 2 + k amp; (1,3+k) on the graph of f. k=2 a) Write you equation after substituting in the value of k.

I need help to understand derivative in calculus, for example I have a

PROBLEM: Given f(x)=4x - x2 + k & (1,3+k) on the graph of f.

k=2

a) Write you equation after substituting in the value of k.

b) Calculate the function values, showing your calculations, then graph three secant lines

i. One thru P(1,f(1)) to P1(0.5,__)

ii. One thru P(1,f(1)) to P2(1.5,__)

iii. One thru P1 to P2                                                                                                                         

c) Find the slope of each of these three secant lines showing all calculations.                        

d) NO DERIVATIVES ALLOWED HERE! Use the results to estimate the slope

of the tangent line at (1,3+k).

e) How would you improve your approximation?     

Thanks in advance. I'm preparing for a math test so walk me thru please!