Question

a=1+√7 find -6/a
I will mark brain list
who will give answer with explanation​

Answer 1

a = 1 + √7

So, -6/a =

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

Now, we'll rationalise the denominator by multiplying with $\frac{1-\sqrt{7}}{1-\sqrt{7}}$

So,

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

$\frac{-6({1-\sqrt{7}})}{1^2 - (\sqrt{7})^2}$

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

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

$\frac{6 -6\sqrt{7}}{6}$

I am honestly not sure if this is right, it's been a while since i've rationalised denominators :X

Answer 2

Answer:

1+√7

Step-by-step explanation:

please mark as brainliest.