book Maths Puzzle Numerical Ability

Simplify by rationalizing the denominator:
(/11-/5)
________
(/11+5)

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book Other Question

This question is actually about elimination because there werent any catorgories for elimination. My question is:
5x-4y=1
7x+4y=11

Thanks for the help! How do you simplify an equation like this {{{r^2+3s^2+8r+5^r2}}} ??? Please Help me