Simplify 54x9 y7.

A) 3x4 y3 6 B) 3x4 y3 6xy C) 9x4 y3 6xy D) 9x3 y3 6xy

Simplify the square root of 54x^9y^7 or √ (54x^9y^7)

54x^9y^7 = (3x^4y^3) ^2 (6xy)

Now square root of (3x^4y^3) ^2 = 3x^4y^3

So the final answer is 3x^4y^3 √ (6xy)

Hence option "B" is correct.