book Maths Puzzle Numerical Ability

Someone please help me>>>>>>

I need to learn how to simplify the following

(3-sqrt4)*(3+sqrt4)

Thanks

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book Other Question

Could you please show me all steps taken to obtain an answer for the following word problem:

A manufacturer makes silver rings and bracelets. Rings require 5 grams of silver and Solve for b: 6-3(b+4)=-(2b-6)-(b-1)