Question 1143592
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The simplest way to answer the questions is to use a calculator (or computer).


{{{sqrt(65)-9}}} = -0.93774  (approximately; with 4 correct decimals);


{{{sqrt(50)-8}}} = -0.92893  (approximately; with 4 correct decimals).


If you want to say "determine it WITHOUT USING a calculator", then change your post appropriately.