exam Maths Puzzle Numerical Ability

Can someone show me how to Multiply and then simplify the product. All variables represent positive real numbers. Thanks

(7+2 3 into √6)(7- 3 into √6) (square root).

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exam Other Question

Preform the indicated operation: 4/(x -6) + 3/(2x- 6) The formula b(t) = 1.353(1.9025)^t represents the number of broadband internet users (in millions) where t if the time in years measured from 1998. How many broadband users (to the nearest million) does this formula predict for 2004?