3 · 3
can also be written in exponential form.
3 · 3 =
3^{2} = 9
6 · 6 =
6^{2} = 36
You can read more about this in chapter 6.
If we think about the number 49 and imagine which positive numbers are multiplied by themselves which become 49.
x · x =
x^{2} = 49
Hopefully you know that this is the number 7 because
7 · 7 = 49.
In mathematics, we have created a sign which shows when we are looking for a positive number multiplied by itself to become the number in question.
The sign is called the square root sign, .
The square root of 49 becomes then 7.
= 7^{2/2}= 7
= 9^{2/2}= 9
= 11^{2/2} = 11
