Question

If a = 1 +√7 , find the value of −6

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Answer 1

Answer:

-6=-6

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Answer 2

Answer:

Rationalise the denominator

1/a = 1/(1+√7)= 1×(1-√7)/{(1+√7)(1-√7)}

=(1-√7)/(1-7) =(1-√7)/(-6)

By cross multiplying

(-6)/a = (1-√7)

Therefore (-6) = a×(1-√7)

Ans