Q. 4 D4.5( 11 Votes )

If <span lang="EN

Answer :

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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