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Algebra II : Mathematical Relationships and Basic Graphs

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Example Questions

Example Question #4842 : Algebra Ii

Solve for x: -3|2x+5|=9x

Possible Answers:

x = 1

x=-1, 5

x=-1, -5

x=-1

Correct answer:

x=-1

Explanation:

First, divide both sides by -3:

|2x+5|=-3x

Whatever is inside the absolute value brackets could be positive or negative.

Positive: 2x+5 = -3x

5 = -5x

-1= x

Negative: 2x+5 = 3 x

5=x

Both of those answers may not work, however, so test both:

|2(-1)+5|=-3(-1)

|3| = 3

3=3

|2(5)+5|=-3(5)

|15| = -15

$15 \neq -15$

The only answer that works is -1.

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Example Question #4843 : Algebra Ii

Solve for x: |5x+3|-7=10

Possible Answers:

x=-2.8, 2.8

x=4, -2.8

x=4, -4

x=2.8, -4

Correct answer:

x=2.8, -4

Explanation:

First, add 7 to both sides:

|5x+3| = 17

Whatever is inside the absolute value brackets could either be positive or negative:

5x+3 = 17

5x = 14

x=2.8

5x+3 = -17

5x = -20

x=-4

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Example Question #4844 : Algebra Ii

Solve for x: 2|1-3x|+7 = 10

Possible Answers:

$x=-\frac{1}{6}$

$x=6, - \frac{5}{6}$

$x = - \frac{1}{6}, \frac{5}{6}$

$x = - \frac{1}{6}, -\frac{5}{6}$

$x= -\frac{3}{2} , -\frac{15}{2}$

Correct answer:

$x = - \frac{1}{6}, \frac{5}{6}$

Explanation:

First subtract 7 from both sides:

2|1-3x | = 3 divide both sides by 2

|1-3x | = 1.5

The expression inside the absolute value brackets could be positive or negative.

Positive: 1-3x = 1.5

$-3x = .5 = \frac{1}{}2$

$x=-\frac{1}{6}$

Negative: 1-3x = -1.5

$-3x = -2.5 = -\frac{5}{2}$

$x=\frac{5}{6}$

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Example Question #4845 : Algebra Ii

Solve for x: |3x+5| = 2x - 3

Possible Answers:

x=-0.4

No solution

x=-8, -0.4

x=8

x=-8

Correct answer:

No solution

Explanation:

The expression inside the absolute value brackets could be either positive or negative.

Positive:

3x+5 = 2x -3 subtract 5 from both sides

3x = 2x-8 subtract 2x from both sides

x=-8

Negative:

3x + 5 = -2x + 3 subtract 5 from both sides

3x = -2x -2 add 2x to both sides

5x = -2 divide both sides by 5

x=-0.4

Now see if either actually works:

|3(-8)+5| = 2(-8)-3

|-24+5| = -16 - 3

|-19| = -19

$19 \neq -19$

|3(-.4)+5| = 2(-.4)-3

|-1.2+5| = -.8 - 3

|3.8| = -3.8

$3.8 \neq -3.8$

Neither actually works.

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Example Question #59 : Absolute Value

Solve for x: |4x+1| -3 = 2x + 5

Possible Answers:

x=3.5, -1.5

x=3.5, -3.5

$x=-3.5, -\frac{7}{6}$

x=1.5, -3.5

Correct answer:

x=3.5, -1.5

Explanation:

First, add 3 to both sides:

|4x+1| = 2x + 8

Either the expression inside the brackets is positive or it is negative.

Positive: 4x+1 = 2x+8 subtract 1 from both sides

4x = 2x + 7 subtract 2x from both sides

2x = 7 divide both sides by 2

x=3.5

Negative: 4x+1 = -2x -8 subtract 1 from both sides

4x = -2x - 9 add 2x to both sides

6x = -9 divide both sides by 6

x=-1.5

Now check to be sure both actually work.

|4(3.5)+1| -3 = 2(3.5) + 5

|14 + 1 | - 3 = 7+5

15 - 3 = 12

12 = 12

|4(-1.5) + 1 | - 3 = 2(-1.5) + 5

|-6+1| -3 = -3 + 5

5-3 = -3 + 5

2= 2

Both work.

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Example Question #60 : Absolute Value

Solve for x: $\frac{1}{3} | x-4 | = 1 - 2x$

Possible Answers:

x=1, -0.2

x=0, -1

x=-0.2

x=-0.2, -1

Correct answer:

x=-0.2

Explanation:

First, multiply both sides by 3:

|x-4| = 3-6x

The expression inside the absolute value brackets could either be positive or negative.

Positive: x-4 = 3-6x add 6x to both sides

7x -4 = 3 add 4 to both sides

7x = 7 divide both sides by 7

x= 1

Negative: x-4 = 6x - 3 add 4 to both sides

x = 6x + 1 subtract 6x from both sides

-5 x = 1 divide both sides by -5

x=-0.2

Now test to see if both answers actually work.

$\frac{1}{3} |1-4 | = 1 - 2 (1)$

$\frac{1}{3} |-3| = 1-2$

$\frac{1}{3}\cdot 3 = -1$

$1 \neq -1$ so 1 does not work.

$\frac{1}{3} |-0.2 -4 | = 1-2(-0.2)$

$\frac{1}{3} |-4.2| = 1 + .4$

1.4 = 1.4

The answer is -0.2

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Example Question #61 : Absolute Value

Solve the absolute value: $\left | 3x-8\right | <6$

Possible Answers:

$(-\infty, \frac{2}{3})\bigcup ( \frac{2}{3}, \frac{14}{3})\bigcup (\frac{14}{3},\infty)$

$(-\infty, \frac{2}{3})\bigcup (\frac{14}{3},\infty)$

$(-\infty, \infty)$

$(\frac{2}{3}, \frac{14}{3})$

$[\frac{2}{3}, \frac{14}{3}]$

Correct answer:

$(\frac{2}{3}, \frac{14}{3})$

Explanation:

In order to solve this equation, we will need to eliminate the absolute value signs and rewrite the left term in its positive and negative components.

3x-8<6

-(3x-8)<6

Solve the first equation. Add eight on both sides.

3x-8+8<6+8

3x<14

Divide by three on both sides.

The first solution is: $x<\frac{14}{3}$

Divide the second equation by negative one. Dividing a negative value will require switching the direction of the sign.

$\frac{-(3x-8)}{-1}<\frac{6}{-1}$

3x-8>-6

Add eight on both sides.

3x-8+8>-6+8

3x>2

Divide by three on both sides.

$\frac{3x}{3}>\frac{2}{3}$

The second solution is: $x>\frac{2}{3}$

The answer is: $(\frac{2}{3}, \frac{14}{3})$

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Example Question #62 : Absolute Value

$\left | 4+x \right |> 9$

Possible Answers:

0> x> 5

-5> x> 5

-13> x> 13

-13> x> 5

5> x> 13

Correct answer:

-13> x> 5

Explanation:

Recall that when dealing with absolute value, you have to write the inequality two different ways to solve it:

1) 4+x> 9

2) 4+x< -9

Now, solve each one
1) x> 5

2) x< -13

Put those answers together to get your final answer:

-13> x> 5

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Example Question #4851 : Algebra Ii

Solve: $3\left | x-1\right |+7 =6$

Possible Answers:

$-\frac{2}{3}, \frac{2}{3}$

$\textup{No solution.}$

$\frac{3}{4}, 2$

$-\frac{2}{3}, \frac{4}{3}$

$-\frac{3}{4}, \frac{2}{3}$

Correct answer:

$\textup{No solution.}$

Explanation:

Start by isolating the absolute value.

Subtract seven on both sides.

$3\left | x-1\right |+7 -7=6-7$

$3\left | x-1\right |=-1$

Divide by three on both sides.

$\frac{3\left | x-1\right |}{3}=\frac{-1}{3}$

$\left | x-1\right |=-\frac{1}{3}$

There is no value of in an absolute value that will give a negative value since the absolute value will convert all numbers to positive.

The answer is: $\textup{No solution.}$

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Example Question #2182 : Mathematical Relationships And Basic Graphs

Solve for x: |3-x| = 19

Possible Answers:

x=-16, 16

x=-21, 21

x = -16, 22

x= 21, 16

Correct answer:

x = -16, 22

Explanation:

What is inside the absolute value brackets could be positive or negative.

Positive: 3-x = 19

-x = 16

x = -16

Negative: 3-x = -19

-x = -22

x= 22

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Algebra II : Mathematical Relationships and Basic Graphs

Study concepts, example questions & explanations for Algebra II

All Algebra II Resources

Example Questions

Example Question #4842 : Algebra Ii

Example Question #4843 : Algebra Ii

Example Question #4844 : Algebra Ii

Example Question #4845 : Algebra Ii

Example Question #59 : Absolute Value

Example Question #60 : Absolute Value

Example Question #61 : Absolute Value

Example Question #62 : Absolute Value

Example Question #4851 : Algebra Ii

Example Question #2182 : Mathematical Relationships And Basic Graphs

All Algebra II Resources

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