The function's features are as follow
The domain of parabolic equation is all real numbers
Range: y ≤ 1
c. the x-intercepts: -1 and 1
d. the y-intercept: 1
e f(-4) = -15
How to find the missing value
The missing value of the function is solved by finding the equation of the function
The equation of the function in vertex form is
y = a (x - h)² + k
The vertex is at (0, 1)
y = ax² + 1
Solving for a using point (2, -3)
-3 = a(2)² + 1
-4 = 4a
a = -1
hence the equation is y = -x² + 1
For x = -4
y = -(-4)² + 1 = -15