Finding the vertex form of y = -0.0110x^2 + 1.23x + 5.50

[Bladesofhalo]

I need to write the below function in vertex form.
y = -0.0110x^2 + 1.23x + 5.50

 

[arthur ohlsten]

y=-.011x^2 + 1.23x +5.5 factor out -.011 from first two terms
y=-.011 [x^2-111.82 x ] + 5.5 complete the square
y=-.011 [x^2-111.62x +3125.83]+34.384 +5.5
y=-.011 [x-55.81]^2+39.884 a parabola open down
vertex at 55.81,39.884
Arthur