Question 184048
Quicknote:
(a-b)<sup>2</sup>=a<sup>2</sup>-2ab+b<sup>2</sup>

Let a=g
    b=2

then
(g-2)<sup>2</sup>=g<sup>2</sup>-2*g*2+2<sup>2</sup>=g<sup>2</sup>-4g+4

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