What is the simplified form of? 12x6 12x18 72x6 72x18

12*x^18

Step-by-step explanation:

144 = (2^4) * (3^2)

then

sqrt (144 x^36) = sqrt (144) * sqrt (x^36)

sqrt (144) = sqrt ((2^4) * (3^2)) = 2² * 3=12

sqrt (x^36) = x^ (36/2) = x^18

therefore

sqrt (144 x^36) = sqrt (144) * sqrt (x^36) = 12*x^18

the answer is 12*x^18