Question

Evaluate:(√5+2√2)+(√8-2√15)

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Answer 1

Answer:

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Explanation:

pls evaluate {whole root(5+2 root 6)} + {Whole root(8-2 root 15)} Sol: We know that (√a+√b)2 = a+b+2√ab Now √(5 + 2√6). If it is a perfect sq, there will be 2 no.s - such that a + b = 5. 2√ab = 2√6 ⇒ ab = 6 (a=3, b=2)

Answer 2

Answer:

Explanation: If steam is passed over red hot iron, it is converted into its magnetic oxide and hydrogen gas. If on the other hand, hydrogen is passed over heated magnetic oxide, it will change back to iron and steam. This reaction can be made to proceed in both directions, so it is called reversible reaction.