Chapter 1: Q. 16MCQ (page 27)

Evaluate the expression when $x = 20 and y = 5$ .
$3 (x - y)$

Short Answer

Expert verified

The value of the expression is45.

Step by step solution

Step 1 . Order of operations

To evaluate any expression involving more than one operation, follow the below order of operations:

First evaluate expressions inside grouping symbols like parentheses ( ) or brackets [ ].
Evaluate the exponents.
Perform Multiplication and division from left to right.
Perform addition and subtraction from left to right.

Step 2 . Evaluate inside grouping symbol

To evaluate the given expression $3 (x - y)$ , substitute 20 for x and 5 for y and simplify further as shown below

$\begin{matrix} 3 (x - y) = 3 (20 - 5) \\ = 3 (15) \end{matrix}$

Step 3 . Multiply the numbers

Now to simplify further, multiply the numbers to get

$\begin{array}{l} 3 (15) \\ = 45 \end{array}$

Thus, the value of the expression is 45.

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Evaluate the expression when $x = 20 and y = 5$ .
$3 (x - y)$

Short Answer

Step by step solution

Step 1 . Order of operations

Step 2 . Evaluate inside grouping symbol

Step 3 . Multiply the numbers

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Evaluate the expression whenx=20andy=5.3(x−y)

Short Answer

Step by step solution

Step 1 . Order of operations

Step 2 . Evaluate inside grouping symbol

Step 3 . Multiply the numbers

One App. One Place for Learning.

Most popular questions from this chapter

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Evaluate the expression when $x = 20 and y = 5$ .
$3 (x - y)$