Answer:
x=-2√3 -3, 2√3 -3
Step-by-step explanation:
x^2+6x=3
x^2+6x+9=3+9
(x+3)^2=12
x+3=±√12
1). x+3=√12
x+3=2√3
x=2√3 -3
2). x+3=-√12
x=-2√3 -3
25.5
The way to do this is:
80 * 3.14 equals to roughly 25.5
and minimum value of f(x) is 12