Respuesta :
It will be a parabola withe line of symmetry = y axis and will open downwards. The coefficient of x^2 will be -1.
As it will have a maximum and y intercept of y = 4 the function will be
f(x) = -x^2 + 4
As it will have a maximum and y intercept of y = 4 the function will be
f(x) = -x^2 + 4