Chapter 1.2, Problem 59PPE

To determine

To find: using grouping symbols to make the given equation true.

Answer to Problem 59PPE

The new statement $\left(ii\right)$ obtained by adding parentheses in statement $\left(i\right)$ has now become a true statement.

Explanation of Solution

Given:

  $3.4+5-6+7=28$ .

Concept used:

There are basically three types of grouping symbol which are parentheses, brackets and braces which are used to group numbers or variables.

Bracket of division multiplication addition and subtraction $\left(BODMAS\right)$ .

Abiding the rules of $\left(BODMAS\right)$ Subtraction cannot be done before addition therefore the grouping symbol is necessary to derived the exact solution.

Calculation:

According to the given expression:

  $3.4+5-6+7=\mathrm{28....}\left(i\right)$

To make given statement true, parentheses will be added inserted to $4+5$ and new statement will look like:

  $3.\left(4+5\right)-6+7=\mathrm{28....}\left(ii\right)$ .

Checking the truthfulness of new statement:

Left hand side of $\left(2\right)=3.\left(4+5\right)-6+7$ .

Simplifying the brackets, it becomes:

  $\begin{array}{l}\Rightarrow 3.9-6+7.\\ \Rightarrow 27-6+7.\\ \Rightarrow 28.\end{array}$

Hence, new statement $\left(ii\right)$ obtained by adding parentheses in statement $\left(i\right)$ has now become a true statement.