Provided f(x) = (2x + 5)(9 - 2x):
i) Write a function in form f(x) = ax2+ bx + c
ii) Does graph of the function have the maximum orminimum point? How can you tell?
iii) Determine its vertex by using axis of symmetry x =-b/2a
iv ) Determine zeros of function f by any algebraic method.