How isx-1 - 22-x-1 - 22-x

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(x±a)(x±b) = x²±(a+b)x+ab.

How isx+1 / 2...

Question

How is
{(x + 1) / 2}^2.- {(x - 1) / 2}²= x

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\frac{1}{2}

\frac{x}{2}

\frac{1}{2^{2}}

\frac{x}{2^{2}}

If a x (-1) = 22, then a is

p (x) = x^{2} - 2 \sqrt{2} x + 1

p (2 \sqrt{2}) =

4 \sqrt{2}

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