Class 9th math 3.1 solution english PCTB

Question 2: Write each of the following sets in tabular forms:

\((ii) \; \) \(\{x\mid x\in R\land 2x+1=0\} \)

Solution:

\[
\begin{align*}
2x+1&=0\\
2x&=-1\\
x&=-\frac{1}{2}
\end{align*}
\]

Tabular Form:

\(\{-\frac{1}{2}\}\)


Explanation:

The condition says: “\(x\) is a real number such that \(2x+1=0\)”

Solving the equation gives only one value: \(x = -\frac{1}{2}\)

So, this set contains just a single real number: i.e. \(\{-\frac{1}{2}\}\)

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