Answer :

Given that,

x + = 12


Squaring both sides, we get


(x + )2 = 122


x2 + ()2 + 2 × x × = 144


x2 +  = 142


Subtract 2 from both sides, we get


x2 + - 2 × x × = 142 – 2


(x - )2 = 140


x - = �

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