10.
9√256
= 9 × √256
= 9 × 16
= 144
11.
√3 × √2
= √(3 × 2)
= √6
12.
√9 × √9
= √(9 × 9)
= √81
= 9
13.
√20 × √8
= √(20 × 8)
= √160
= √(16 × 10)
= √16 × √10
= 4 × √10
= 4√10
14.
√20 × √10
= √(20 × 10)
= √200
= √(100 × 2)
= √100 × √2
= 10 × √2
= 10√2
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