If 
let us calculate simplified value of
Formula used.
(a + b)3 = a3 + b3 + 3ab(a + b)
If
x + 
= 2√7
(a + b)3 = a3 + b3 + 3ab(a + b)
Put a = x and b = 
(x + 
)3 = x3 + 
3 + 3 × x × 
× (x + 
)
(2√7)3 = x3 + 
+ 3 × (2√7)
56√7 = x3 + 
+ 6√7
x3 + 
= 56√7 – 6√7
x3 + 
= √7 [56 – 6]
= 50√7
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Generated by AI. May contain inaccuracies — always verify with your textbook.
