Question

Explain the above marked step​

Answer 1

Step-by-step explanation:

in that step given formula is used

=(a+b)^2=a^2+b^2+2a×b

I hope it will help you

Answer 2

Answer:

(√3+√2)² = √3² + √2² + 2*√3*√2 [ (a+b)²= a²+b²+2*a*b ]

here, a = √3 and b =√2

=> 3 + 2 + 2√6 [ √3² = 3 , √2² = 2 and √3*√2=√6]

similarly (√3-√2)² = 3 + 2 - 2√6 [ (a-b)²= a²+b²-2ab]

(√3 - √2)(√3+√2) = √3²-√2² = 3 - 2 [ (a+b)(a-b)=a²-b² ]