If 
let us calculate simplified value of
Formula used.
(a + b)2 = a2 + b2 + 2ab
x + 
= 2√7
(a + b)2 = a2 + b2 + 2ab
Put a = x and b = 
(x + 
)2 = x2 + 
2 + 2 × x × 
(2√7)2 = x2 + 
+ 2
4 × 7 = x2 + 
+ 2
28 = x2 + 
+ 2
x2 + 
= 28 – 2 = 26
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