Q27. - Algebra 1

Question

Evaluate each expression.

$\left[\left(6^3-9\right)÷23\right]4$

Step-by-Step Solution

Answer

The value of the expression $\left[\left(6^3-9\right)÷23\right]\mathbf{4}$ is 36.

Step 1. Order of operations.

In order to evaluate an expression, the order of operations must be followed, which is:

1. Evaluate the expressions inside the bracket
2. Evaluate the powers
3. Multiply and/or divide
4. Add and/ or subtract 

The evaluation takes place from left to right.

Step 2. Evaluate the expression inside the bracket.

In order to evaluate the expression inside the bracket, first, evaluate the innermost expression $\left(6^3-9\right)$.

$\begin{array}{l}\left[\left(6^3-9\right)÷23\right]4=\left[\left(216-9\right)÷23\right]4\\ =\left[\left(207\right)÷23\right]4\\ =\left[9\right]4\\ =9\cdot 4\end{array}$

Step 3. Multiply 9 by 4.

As per the order of operations, now apply the multiplication operation.

$\begin{array}{l}\left[\left(6^3-9\right)÷23\right]4=9\cdot 4\\ =36\end{array}$

Therefore, the expression is equal to 36.