exam Maths Puzzle Numerical Ability

Multiply.

(sqrt11 - sqrt5)(sqrt11 + sqrt5)

Thanks

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exam Other Question

The larger of two consecutive integers is 7 greater than twice the smaller. Find the integers.... We were given a practice question and then the answer. I do not understand how they came up with the "3's" in the eqaution below. If you could explain this, I would greatly appre