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Big Ideas Math: Modeling Real Life, Grade 8

BI

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

1. Finding Square Roots

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Exercise 19 Page 376

Remember the order of operations.

- 4

Practice makes perfect

To evaluate the given numeric expression, we need to remember the order of operations. The acronym PEMDAS can help with that!

pemdas

Let's now consider our expression.

sqrt(81/9) - 7 We first need to calculate the square root. To find the value of the root, we simplify its radicand, which in this case is a quotient. sqrt(81/9)-7 divide ⟶ sqrt(9)-7 Next, we can calculate the square root. Because we know that 3^2=9, we know that sqrt(9)=3. sqrt(9)-7 calculate root ⟶ 3-7 Now we can finish evaluating our expression by subtracting the remaining terms. 3-7 ⇔ - 4

Subchapter links

Try It p.374-376

Self-Assessment for Concepts & Skills p.376

Self-Assessment for Problem Solving p.377

Review & Refresh p.378

Concepts, Skills, & Problem Solving p.378-380