Chapter 1: Q2B. (page 10)

Evaluate the expression $20 - 7 + 8^{2} - 7 \cdot 11$ .

Short Answer

Expert verified

The simplification expression of $20 - 7 + 8^{2} - 7 \cdot 11$ is 0.

Step by step solution

Step 1. Apply the BODMAS rule.

According to the BODMAS rule of simplification, at first, the multiplication operation must be completed followed by addition and then subtraction.

Step 2. Example of applying BODMAS rule.

The expression $2 - 5^{2} + 20$ can be written as

$\begin{array}{l} 2 - 5^{2} + 20 = 2 - (5 \times 5) + 20 \\ = 2 - 25 + 20 \\ = (2 + 20) - 25 \\ = 22 - 25 \\ = - 3 \end{array}$

Step 3. DESCRIPTION OF STEP.

The expression $20 - 7 + 8^{2} - 7 \cdot 11$ can be simplified as follows:

$\begin{array}{l} 20 - 7 + 8^{2} - 7 \cdot 11 \\ = 20 - 7 + (8 \times 8) - (7 \times 11) \\ = 20 - 7 + 64 - 77 \\ = 20 + 64 - 7 - 77 \\ = 84 - 84 \\ = 0 \end{array}$

Hence, the simplified expression $20 - 7 + 8^{2} - 7 \cdot 11$ is 0.

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Evaluate the expression $20 - 7 + 8^{2} - 7 \cdot 11$ .

Short Answer

Step by step solution

Step 1. Apply the BODMAS rule.

Step 2. Example of applying BODMAS rule.

Step 3. DESCRIPTION OF STEP.

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Evaluate the expression 20−7+82−7⋅11.

Short Answer

Step by step solution

Step 1. Apply the BODMAS rule.

Step 2. Example of applying BODMAS rule.

Step 3. DESCRIPTION OF STEP.

One App. One Place for Learning.

Most popular questions from this chapter

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Evaluate the expression $20 - 7 + 8^{2} - 7 \cdot 11$ .