book Maths Puzzle Numerical Ability

simplify/reduce
x^2/x^2-4
all minus
x+2/x-2

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book Other Question

The sum of two numbers is 1457. Four times the first number minus twice the second number is 8. Find the larger number.

I had to turn my book in so I no longer can find the answer. I am in 8th grade Pre-Algebra 2. simplify the following expression by rationalizing the denominator:

5square root of 2 over(/) 4 square root of 3 - the square root of 5