# Algebra

posted by
**Katie**
.

write in form y=a(x-h)^2+k

y=x^2-x-9

(x^2-2x)-9

complete the square

(x^2+2x+1-1)-9

(x^2+2x+1)-1-9

(x+1)^2-9

posted by
**Katie**
.

write in form y=a(x-h)^2+k

y=x^2-x-9

(x^2-2x)-9

complete the square

(x^2+2x+1-1)-9

(x^2+2x+1)-1-9

(x+1)^2-9