Verified answer

1) √10c²= -c√10

2) √108a¹⁶= 6a⁸√3

3)√-x¹⁹= √-x*x¹⁸= x⁹√-x

4) √-b²¹c²⁶= b¹⁰c¹³√-b

1) √10c² = |c|√10 = -c√10

c <= 0

2)√108a^16 = 6a^8√3

3)√-x^19 = -x^9√-x

x < 0

4)√-b^21•c^26 = b^10•c^13√-b

c > 0 => b < 0