Question

what number must be added to the expression below to complete the square? x^2-x
A. 1/2
B. -1/4
C. -1/2
D. 1/4

Answer 1

(a+b)^2 = a^2 + 2ab + b^2

Think real hard on the relationship between 2ab and b^2.

Answer 2

i really dont have a clue :(

Answer 3

Take the coefficient of x (which is -1) divide it by 2, and square it.

Answer 4

That '2' in there is magic.

Answer 5

-1/2 am i correct???

Answer 6

Not quite. Square it.