6. The square root of 5 less than a certain number is 0. Find the number.

7. The square root of 4 more than a number is equal to 2 less than the number.

Find the number.

8. The square root of 7 more than a number is the square root of 14. Find the

number.

9. Can the difference of 4 and the principal square root of a number ever equal

0? Why?

10. The square root of twice a number is equal to the square root of 18 more

than the number. Find the number.​