book Maths Puzzle Numerical Ability

I need to know how to solve (5x-2)(5x+2) and to show my work too.

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book Other Question

The sum of 2 consecuttive odd intergers is less than 80.what are the largest possible values for the intergers? Idk how to solve and check this problem,

The sum of a number and its reciprocal is 10/3. What is the number?