Question

1. (√18×√3) √2 =
2.(√3+√5) (√3-√5) =

Answer 1

1. (√18 × √3)√2
  = (√(18×3))√2
  = (√54)√2
  = 3√6 × √2
  = 3√12
  = 3√4×3
  = 3×2√3
  = 6√3
2. (√3 + √5)(√3 - √5)
Dengan menggunakan prinsip (a+b)(a-b) = a²-b², maka
(√3+√5)(√3-√5)
= (√3)² - (√5)²
= 3 - 5
= -2

Answer 2

1).

=> ( √18 × √3 ) √2
= √54 × √2
= √108
= 6√3

2).

=> ( √3 + √5 ) ( √3 - √5 )
= √9 - √15 + √15 - √25
= 3 - 5
= -2