Question

If a=1+root7 find -6/a

Answer 1

Answer:

1 - √7

Step-by-step explanation:

$a = 1 + \sqrt{7}$

Therefore,

$\frac{ - 6}{a} = \frac{ - 6}{1 + \sqrt{7} }$

Rationalising the denominator,

$\frac{ - 6}{1 + \sqrt{7} } \times \frac{1 - \sqrt{7} }{1 - \sqrt{7} }$

$= \frac{ - 6(1 - \sqrt{7}) }{ - 6}$

$= 1 - \sqrt{7}$

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Answer 2

Answer:

HERE U GO..

A = 1 + ROOT7

= -6/a

= (1-root7) / ( 1-root7 ) / ( 1-root7 )

= 6 ( 1root7 ) / 1-7 ------(a^2-b IN DENOMINATOR.

= 6 (1-root7 ) /-6

= 1-root7 /-1

= 1+root7

or

= root 7-1

Step-by-step explanation:

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