Question

... I don't understand the concept I think first place so um yea oh and I have an exam tomorrow pls I need help

Answer 1

We know that :

• (a + b)² = a² + b² + 2ab

• 
  `(√(x))^2 = (x^(1)/(2))^2 = x^(2)/(2) = x`

• 
  `(√(a))(√(b)) = √(ab)`

Now using above ideas, we can solve the Problem

`(√(8) + √(2))^2 = (√(8))^2 + (√(2))^2 + 2(√(8))(√(2))`

`(√(8) + √(2))^2 = 8 + 2 + 2(√(16)) = 8 + 2 + 2(4) = 10 + 8 = 18`