Answer:
y = - x² + 4
Step-by-step explanation:
The equation of a parabola whose vertex is on the y- axis is
y = ax² + c
where a is a multiplier and c is the y- intercept
• If a > 0 then minimum vertex
• If a < 0 then maximum vertex
Here vertex is a max, thus a = - 1 and c = 4
Then equation of parabola is
y = - x² + 4
