SAT II Math II : Solving Inequalities

Study concepts, example questions & explanations for SAT II Math II

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Example Questions

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Example Question #31 : Single Variable Algebra

Solve .

Possible Answers:

Correct answer:

Explanation:

Remember, anything we do to one side of the inequality, we must also do to the other two sides.  We can start by adding one to all three sides:

And now we divide each side by two:

Example Question #32 : Single Variable Algebra

Solve .

Possible Answers:

Correct answer:

Explanation:

The first thing we can do is distribute the negative sign in the middle term.  Because we're not multiplying or dividing the entire inequality by a negative, we don't have the change the direction of the inequality signs:

Now we can subtract  from the inequality:

And finally, we can multiply by .  Note, this time we're multiplying the entire inequality by a negative, so we have to change the direction of the inequality signs:

Example Question #33 : Single Variable Algebra

Solve .

Possible Answers:

Correct answer:

Explanation:

We start by distributing the :

Now we can add , and subtract an  from each side of the equation:

We didn't multiply or divide by a negative number, so we don't have to reverse the direction of the inequality sign.

Example Question #14 : Solving Inequalities

What is the solution set for ?

Possible Answers:

Correct answer:

Explanation:

Start by finding the roots of the equation by changing the inequality to an equal sign.

Now, make a number line with the two roots:

1

Pick a number less than  and plug it into the inequality to see if it holds.

For ,

 is clearly not true. The solution set cannot be .

Next, pick a number between .

For ,

 is true so the solution set must include .

Finally, pick a number greater than .

For ,

 is clearly not the so the solution set cannot be .

Thus, the solution set for this inequality is .

Example Question #34 : Single Variable Algebra

Give the solution set of the inequality:

Possible Answers:

Correct answer:

Explanation:

First, find the zeroes of the numerator and the denominator. This will give the boundary points of the intervals to be tested.

 

 

Since the numerator may be equal to 0,  and  are included as solutions. However, since the denominator may not be equal to 0,  is excluded as a solution. 

Now, test each of four intervals for inclusion in the solution set by substituting one test value from each:

 

Let's test :

This is false, so  is excluded from the solution set.

 

Let's test :

This is true, so  is included in the solution set.

 

Let's test :

This is false, so  is excluded from the solution set.

 

Let's test :

This is true, so  is included in the solution set.

 

The solution set is therefore .

Example Question #35 : Single Variable Algebra

Solve the inequality:  

Possible Answers:

Correct answer:

Explanation:

Add 6 on both sides.

Divide by five on both sides.

The answer is:  

Example Question #36 : Single Variable Algebra

Solve the inequality:  

Possible Answers:

Correct answer:

Explanation:

Add six on both sides.

Divide by three on both sides.

The answer is:  

Example Question #41 : Single Variable Algebra

Solve the inequality:  

Possible Answers:

Correct answer:

Explanation:

Subtract nine from both sides.

Divide by negative 3 on both sides.  We will need to switch the sign.

The answer is:  

Example Question #42 : Single Variable Algebra

Solve the inequality:  

Possible Answers:

Correct answer:

Explanation:

Add seven on both sides.

Divide by three on both sides.

The answer is:  

Example Question #43 : Single Variable Algebra

Solve: 

Possible Answers:

Correct answer:

Explanation:

First, we distribute the  through the equation:

Now, we collect and combine terms:

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