Question

complete the square. z^2-4z

Answer 1

z^2-4z
=(z-2)^2 - 4

Answer 2

Hint:
As an \(example\):
x^2-6x
=(x^2-2(3x)+3^2) -3^2 ....... create perfect square inside of brackets
=(x-3)^2-3^2
=(x-3)^2-9
The objective is to make a perfect that includes all the variables, and add a constant...if necessary.

Answer 3

Lemaz that doesnt make much sense.. I think the answer is z^2-4z+4 but im not sure

Answer 4

Usually completing the square does not change the value of the expression.
In your case, perhaps you are learning what a perfect square looks like, that's why you're expected to add a four to the given expression. The same term out of context can mean different things.
By the way, I hope you noticed that I gave an example, it was not a solution to the problem.

Answer 5

yeah i noticed haha