00:01
Hi there, in this question we just identify numbers as rational or irrational number.
00:08
So we have already known that pi is an irrational number.
00:17
So if you multiply this irrational number by another number, let's say negative 2 times pi, so this number still would be an irrational number.
00:28
So negative 2 pi is irrational number 2.
00:35
Negative 2 times square root of 5 so we cannot take 5 outside of the square root sign that means square root of 5 is again irrational number so if we multiply this irrational number by another number let's say negative 2 times square root of 5 this number is still an irrational number and what about so this is a repeating decimal so we have a formula for this kind of questions and we just convert this repeating decimals into a rational number so i can write this repeating decimal using by the formula which is 2985 minus 29 divided by.
01:19
So we have two repeating numbers.
01:21
That means i'm going to put another two nine here.
01:24
So this is the form of rational number.
01:26
So this is a rational number.
01:31
And for 91 .23.
01:35
So again, this is a decimal number...