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y=x^2-a In the equation above a is a p...

`y=x^2-a`
In the equation above a is a positive constant and the graph of the equation in the xy-plane is a parabola. Which of the following is an equivalent form of the equation?

A

`y=(x+a)(x-a)`

B

`y=(x+sqrta)(x-sqrta)`

C

`y=(x+a/2)(x-a/2)`

D

`y=(x+a)^2`

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