Exercise 72 Page 184

Let's see why the other options are not correct.

• A: 2* 3+2* 6 is (3+6)2. We get this if we multiply (3+6) by 2 instead of raising it to the second power.
• C: In evaluating 3^2+6^2, we square the numbers first and add the results instead of adding the numbers first and squaring the result.
• D: 3^2* 6^2 is (3* 6)^2. It is the square of the product, and not the square of the sum.

You can also use a calculator to evaluate these expressions.