Question

Question is attached down below:

Answer 1

using identity (a-b)²

a²-2ab+b²

10-2(√10)(√2)+ 2

12 - 2√5

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Answer 2

Answer:

${( \sqrt{10} - \sqrt{2}) }^{2} \\ \\ = {( \sqrt{10)} }^{2} - 2( \sqrt{10} )( \sqrt{2} ) + ( { \sqrt{2}) }^{2} \\ \\ = 10 - 2 \sqrt{20} + 2 \\ \\ = 12 - 4 \sqrt{5} \\ \\ from \: here...... \\ b = 12 \: \: \: and \: \: \: \: c= 4$