Chapter 8.1, Problem 79CCR

To determine

The value of the expression $5^2-6+6\cdot 8$

Answer to Problem 79CCR

The value of the expression is $67$

Explanation of Solution

Given:

  $5^2-6+6\cdot 8$

Concept Used:

Rules of Addition/ Subtraction:

• Two numbers with similar sign always get added and the resulting number will carry the similar sign.
• Two numbers with opposite signs always get subtracted and the resulting number will carry the sign of larger number.

Rules of Multiplication/ Division:

• The product/quotient of two similar sign numbers is always positive.
• The product/quotient of two numbers with opposite signs is always negative.

Calculation: In order to find the value of expression $5^2-6+6\cdot 8$ as below:

  $\begin{array}{c}{5}^2=5\ast 5=25\\ \text{So the experssion will become}\\ 5^2-6+6\cdot 8\\ =25-6+48\\ =25+42\\ =67\end{array}$

Thus, the value of the expression is $67$