Question

simplify root 2- root 5 whole square

Answer 1

Answer:

(√2-√5)²

acc to (a-b)²=a²+b²-2ab

(√2)²+(√5)²-2(√2)(√5

2+5-2√10

7-2√10

Answer 2

Answer:

( √5 - √2 )²

BY USING ( a + b )^2 = a^2 - b^2 + 2ab

( √5 -√2 )²

⇒ ( √ 5 )² - ( √ 2 )² + 2( √5 × √ 2 )

⇒ 5 + 2 - 2√( 5 × 2 )

⇒ 5 + 2 - 2√10

⇒ 7 - 2√10