Answer :
adding 6 to both sides and taking the square root, remember that x can be the poitivie and negative root
x^2-6=0
add 6
x^2=6
squaer root both sides
x=√6
x=+√6 and -√6
x^2-6=0
add 6
x^2=6
squaer root both sides
x=√6
x=+√6 and -√6