00:01
In this problem, we have been asked to determine whether the given pair of sets is equal.
00:06
Now, the first set is the set containing all the numbers x, says that x squared plus x is equal to 2, and the second set is the set containing the elements 1 and minus 1.
00:20
Now, note that negative 1 belongs to the second set.
00:25
Now, does it belong to the first set? we need to determine whether or not it satisfies this equation to determine that.
00:32
So let us substitute negative 1.
00:35
X is equal to negative 1 in this expression over here.
00:38
If we do that, we have negative 1 squared plus negative 1.
00:42
Negative 1 squared is 1.
00:44
We add negative 1 to that...