Chapter 4.6, Problem 7MRE

To determine

To evaluate the expression

  ${\left(w+y\right)}^2$

When $w=3$ , and $y=4$ .

Answer to Problem 7MRE

49

Explanation of Solution

Given:

  ${\left(w+y\right)}^2$

Concept Used:

• To evaluate an expression having one or more than one variable at the given value of the variable(s), put the given values of variable(s) in their respective place, and evaluate the value of expression.

Calculation:

To evaluate the expression

  ${\left(w+y\right)}^2$

When $w=3$ , and $y=4$ .

Substitute 3 in place of w , and 4 in place of y in the expression as:

  $\begin{array}{c}{\left(w+y\right)}^2={\left(3+4\right)}^2\\ =7^2\end{array}$

Now, evaluate the above square, as

  $7^2=49$

Thus,

  ${\left(w+y\right)}^2=49$

When $w=3$ , and $y=4$ .