General
General
Easy
Question
Given function . Find the value of x when
- 2
- -2
- 1
- -1
Hint:
This question is about a function. A function is a relation between two sets such that every element of first set is related to only one element in second set. In this question, we are given the relation between the input and output of the function. We are also given the value of output. We have to find the value of “x” for which we are getting the given value of function.
The correct answer is: 2
The given function is f(x) = -x + 3
When we substitute the value of x in the function, we get the value of the function for that input.
We have the relation and the value of the output of the function.
f(x) = 1
If we equate the relation and the output of the function, we will get the value of the x or input of the function.
f(x) = -x + 3
1 = -x + 3
Rearranging we get,
-x + 3 = 1
-x = 1 – 3
-x = -2
x = 2
So, for value if x = 2, f(x) = 1.
For such questions, we should know about the concept of functions.
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