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  • Need solution for RD Sharma maths class 12 chapter Functions exercise 2.1 question 8 sub question (iii)

Need solution for RD Sharma maths class 12 chapter Functions exercise 2.1 question 8 sub question (iii)

Answers (1)

f is not bijective.

Given:

            h:A\rightarrow A, given byh(x)=(x)^2

To prove:

Function h is one-one, onto or bijective.

Hint:

For any function to be bijective, the given function should be one-one and onto.

Solution:

First we will check whether the given function is one-one or not.

We know for function h to be one-one

\begin{aligned} &\begin{aligned} & h\left(x_{1}\right)=h\left(x_{2}\right) \\ \Rightarrow & x_{1}^{2}=x_{2}^{2} \\ \Rightarrow & x_{1}=\pm x_{2} \end{aligned}\\ &\text { So, } h \text { is not one-one. } \end{aligned}

h(x)=x^2

Let h(x)=y such thaty \in A

y=x^2

Hence, the value of y is defined only if y is positive,

But y is a real number

Hence, if y is negative, there is not corresponding element of x

i.e; for y=-1 , there is no value of x in A. 

Hence, h is not onto.

Hence, h is not bijective.

Posted by

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