Question

answer with explanation..(class9)
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Answer 1

Answer:

1st answer =6

2nd answer = 7+2√10

Step-by-step explanation:

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Answer 2

Question :- 4

• (3 + √3 ) ( 3 - √3 )

here we can use ( a+b) (a-b) = a²-b² .

= ( 3 + √3 ) ( 3 - √3 ) .

= (3)² - ( √3)²

= 9 - 3

= 6 Ans. (b)

Question :- 5

• ( √5 + √2 ) ²

here we can use ( a + b ) ² = a² + b² + 2 ab

= ( √5 + √2 ) ²

= ( √5)² + ( √2 )² + 2 √5 . √2

= 5 + 2 + 2 √10

= 7 + 2 √ 10 Ans. (C)