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Splash Screen. Five-Minute Check (over Lesson 6–6) CCSS Then/Now New Vocabulary Key Concept: Solving Radical Equations Example 1:Solve Radical Equations Example 2:Solve a Cube Root Equation Example 3:Standardized Test Example: Solve a Radical Equation

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### Splash Screen

Five-Minute Check (over Lesson 6–6)

CCSS

Then/Now

New Vocabulary

Example 2:Solve a Cube Root Equation

Example 3:Standardized Test Example: Solve a Radical Equation

A.

B.

C.

D.

A.12

B.8

C.4

D.2

A.

B.

C.

D.

A.2w2

B.2w

C.w2

D.

A.

B.

C.5

D.10

### 5-Minute Check 5

The equation gives the approximate energy output y in kilocalories per day (kcal/day) for a reptile with a body mass m kilograms. The average mass of an alligator is 360 kilograms. Find the energy output of a reptile this size. Round your answer to the nearest tenth.

A.82.6 kcal/day

B.156.8 kcal/day

C.826.5 kcal/day

D.1568.1 kcal/day

### 5-Minute Check 6

Content Standards

A.SSE.2 Use the structure of an expression to identify ways to rewrite it.

Mathematical Practices

4 Model with mathematics.

### CCSS

You solved polynomial equations.

### Then/Now

• extraneous solution

### Concept

A.Solve .

Original equation

Square each side to eliminate the radical.

Find the squares.

### Example 1

Original equation

?

Replace y with 38.

Simplify.

Check

Answer: The solution checks. The solution is 38.

### Example 1

B. Solve .

Original equation

Square each side.

Find the squares.

Divide each side by –4.

### Example 1

Square each side.

Evaluate the squares.

Original equation

Check

Replace x with 16.

Simplify.

Evaluate the square roots.

Answer: The solution does not check, so there is no real solution.

### Example 1

A. Solve .

A.19

B.61

C.67

D.no real solution

### Example 1

B. Solve .

A.2

B.4

C.9

D.no real solution

### Example 1

In order to remove the power, or cube root, you must first isolate it and then raise each side of the equation to the third power.

Solve a Cube Root Equation

Original equation

Subtract 5 from each side.

Cube each side.

Evaluate the cubes.

### Example 2

Solve a Cube Root Equation

Subtract 1 from each side.

Divide each side by 3.

Check

Original equation

Replace y with –42.

Simplify.

The cube root of –125 is –5.

A.–14

B.4

C.13

D.26

Am = –2

Bm = 0

Cm = 12

Dm = 14

### Example 3

Original equation

Divide each side by 7.

Raise each side to the sixth power.

Evaluate each side.

Subtract 4 from each side.

A.221

B.242

C.266

D.288

### Concept

Since the radicand of a square root must be greater than or equal to zero, first solve 3x – 6  0 to identify the values of x for which the left side of the inequality is defined.

3x – 60

3x6

x2

### Example 4

Original inequality

Divide each side by 3.

Answer: The solution is 2  x  5.

### Example 4

Test some x-values to confirm the solution. Let Use three test values: one less than 2, one between 2 and 5, and one greater than 5.

Check

Only the values in the interval 2  x  5 satisfy the inequality.

A.

B.

C.

D.