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Big Ideas Math: Modeling Real Life, Grade 8

BI

Big Ideas Math: Modeling Real Life, Grade 8 View details

Chapter Review

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Exercise 4 Page 417

Remember the order of operations.

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Practice makes perfect

We need to remember the order of operations to evaluate the numeric expression. The acronym PEMDAS can help with that!

pedmas

Let's now consider our expression. 15 - 4 * sqrt(36) First, we need to calculate the square root. Because we know that 6^2=36, we know that sqrt(36)=6. \begin{gathered} 15-4 \cdot \sqrt{\textcolor{olive}{36}}\quad \stackrel{\text{calculate root}}{\longrightarrow} \quad 15-4\cdot\textcolor{deepskyblue}6 \end{gathered} Now we can finish evaluating our expression. We start with the multiplication and then we subtract the terms.

15-4*6

Multiply

15-24

Subtract terms

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Subchapter links

1 Finding Square Roots p.417

2 The Pythagorean Theorem p.417

3 Finding Cube Roots p.418

4 Rational Numbers p.418

5 Irrational Numbers p.419

6 The Converse of the Pythagorean Theorem p.419