a. x^2-1
b. x^2
c. (x+1)^2
d. (x-1)^2
e. X^2+1

I don't know how to do it, any body can answer this question and step by step tell me how to do it, thank you

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  1. rearrange things a bit and you have

    a = x+1
    b = x-1

    ab = (x+1)(x-1) = x^2-1

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