How do you do square roots?

Question

square root of x=9
And
square roots of x+7=15

Answer 1

The square root of x = 9. That means that 9 is the square root of some unknown number. If 9 is the square root, then multiplying 9 by itself will give you the answer.

Answer 2

"How to manually find a square root
Here is an almost-forgotten art, one that, with the advent of electronic calculators, will likely survive to the twenty-first century only on paper and in the memories of oldsters.

What is the number you want to find the square root of? Here's one we'll use:

46656

First, divide the number to be square-rooted into pairs of digits, starting at the decimal point. That is, no digit pair should straddle a decimal point. (For example, split 1225 into "12 25" rather than "1 22 5"; 6.5536 into "6. 55 36" rather than"6.5 53 6".)

Then you can put some lines over each digit pair, and a bar to the left, somewhat as in long division.

(...)"

Look in:
http://math.arizona.edu/~kerl/doc/square-root.html

to see the method! (There is some graphic that YA! don't show).

Answer 3

use a calculator

use sqrt key, looks like long division tent
however, these are not sqrt problems

for your questions
sqrt x = 9
square both sides

x = 81

sqrt x + 7 = 15
subtract 7 from both sides
sqrt x =8

square both sides

x = 64

Answer 4

with a calculator