book Maths Puzzle Numerical Ability

I need to know how to sovle (x-11)(x+11) and to show my work.

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book Other Question

One number is 12 more than half another number. The two numbers total 60. Find the numbers. i need to know how to convert feet into sq.yds.(surface measurements)
example:A=46ft.x13ft. what do i do next?
am i right to say the total sq. ft. of the area would be 46X2 by 13X2?