00:02
In this question, we are given a function f of x is equals to 1 over square root of 1 negative x squared.
00:09
So we have to answer certain number of questions with true or false.
00:13
So let us construct a graph which looks like this.
00:18
So this is f of x is equals to 1 over square root of 1 negative of x square graph.
00:25
And let us mark this point which is 0 comma 1.
00:28
So the first question is, all negative real numbers are in the domain of f.
00:36
For that, first, we have to identify the domain.
00:39
So the domain here ranges from negative 1 to negative, sorry, positive 1.
00:48
So the domain is negative 1 to 1.
00:51
So from this we can say that all negative real numbers are in the domain of f is false.
00:56
So the answer for first one is false.
01:01
Next we have the question as the ray, sorry, one is in the domain of f.
01:08
So this is the second question we have.
01:11
So from this we can say that the domain ranges from negative 1 comma 1 in an open interval space.
01:18
So 1 is in the domain of f is false.
01:31
Because here the domain lies in the open interval negative 1 to 1.
01:36
So 1 is not a domain here.
01:39
So 3rd 1, we have all positive real numbers or in domain of f.
01:46
So what we have to say is all positive real numbers.
01:50
So which is also a false because we have the range from negative 1 to 1...