-12 would be it because 2 negatives make a positive so -11+23 is -12
Equation: 4 + 4x + x²
Maxima: No maximum value from said equation
Minima: x = -2 since that is the only critical point in the equation
The formula for the surface area of a sphere is

(x-7)(x+12)
X^2 +12x-7x-84
x^2+5x-84. <- answer