Question

simplify
${( \sqrt{2 } - \sqrt{5})} ^{2}$
​

Answer 1

Answer:

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Answer 2

$( \sqrt{2} - \sqrt{5} )^{2} \\ = ( \sqrt{2} )^{2} + (\sqrt{5} ) ^{2} - 2( \sqrt{2})( \sqrt{5} ) \\ = 2 + 5 - 2 \sqrt{10} \\ = 7 - 2 \sqrt{10}$

Remember:

(a-b)²=a²+b²-2ab