tolong jawab no 3 dan 4 yaa

3. √8 x √10 = √80 = √(16 x 5) = 4√5 (A)
4. √320 / √5 + √(9/4) = √64 + 3/2 = 8 + 3/2 = 9 1/2 (B)

Nomor 3
= √8 × √10
= √80
= √(16 × 5)
= 4√5

Opsi A

Nomor 4
= (√320 / √5) + (√9 / √4 )
= (√1.280 + √45) / √20
= (√(256 × 5) + √(9 × 5) / √20
= (16√5 + 3√5) / √20
= 19√5 / √20 × √20 / √20
= 19√100 / 20
= 19.10 / 20
= 19/2
= 9 ½

Opsi B

semoga berguna +_+