Question

f(x)=1/5(x+5)^2+6

Answer 1

find the vertex
the line of symmetry x
max/min of f(-5)=6

Answer 2

x^2 +10x +25 +30=0
x^2 +10x +55 =0
-10 +/- radical (100-220) -10 +/- radical (-120)
x_1,_2 = ------------------------- = --------------------- =
2 2


-10+/-2radical(30) 2(-5+/-radical(30))
= ------------------ = ----------------- = -5+/- radical (30)
2 2