Question

What number must be added to the expression below to complete the square x^2-x

Answer 1

+1/4

Explanation:

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Answer 2

+1/4

Explanation:

We need a formula (a-b)^2=a^2-2ab+b^2

We have a=x and -2ab=x, so b=-1/2, then we add b^2 and it is 1/4.

(X^2-x+1/4)=(x-1/2)^2