Question

plz help
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Answer 1

Answer:

√40

Step-by-step explanation:

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Answer 2

${( \sqrt{2} + \sqrt{5} )}^{2} = (2 + 2 \sqrt{10} + 5) \\ {( \sqrt{2} - \sqrt{5} )}^{2} = (2 - 2 \sqrt{10} + 5) \\ (2 + 2 \sqrt{10} + 5) - (2 - 2 \sqrt{10} + 5) \\ = 2 + 2 \sqrt{10} + 5 - 2 + 2 \sqrt{10} - 5 \\ = 2 - 2 + 2 \sqrt{10} + 2 \sqrt{10} + 5 - 5 \\ = 4 \sqrt{10}$