Question

Completing the square

(Medal) (Fan)

Answer 1

look: x^2 - 11x=x^2-2*5.5*x
(a-b)^2=a^2-2ab+b^2
x^2-2*5.5*x
thus the term we need to find is 5.5.
x^2-2*5.5*x+5.5^2=x^2-11x+5.5^2=(x-5.5)^2

Answer 2

Is that precisely the equation, \(x^2-11x\) ?