diagram shows part of the graph of the function y=p-(x+n)^2,where p and n are constants.find the value of
a)p,
b)n,
c)k
You're already half-way there mate. It's in the form , so to determine the turning, let , and you'll determine the x-coordinate and y coordinate of the turning point of the parabola, compare with the graph to get the values of n and p.
Now set x=o, which sets y=k, from graph and substitute the values of n and p and you'll get your the value of k.