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SAT Math : How to find the solution to an inequality with multiplication

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Example Questions

Example Question #1 : How To Find The Solution To An Inequality With Multiplication

If –1 < n < 1, all of the following could be true EXCEPT:

Possible Answers:

(n-1)² > n

n² < n

|n² - 1| > 1

n² < 2n

16n² - 1 = 0

Correct answer:

|n² - 1| > 1

Explanation:

N_part_1

N_part_2

N_part_3

N_part_4

N_part_5

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Example Question #3 : How To Find The Solution To An Inequality With Multiplication

(√(8) / -x ) < 2. Which of the following values could be x?

Possible Answers:

-1

-2

All of the answers choices are valid.

-4

-3

Correct answer:

-1

Explanation:

The equation simplifies to x > -1.41. -1 is the answer.

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Example Question #181 : Equations / Inequalities

Solve for x

$\small 3x+7 \geq -2x+4$

Possible Answers:

$\small x \leq -\frac{3}{5}$

$\small x \geq -\frac{3}{5}$

$\small x \leq \frac{3}{5}$

$\small x \geq \frac{3}{5}$

Correct answer:

$\small x \geq -\frac{3}{5}$

Explanation:

$\small 3x+7 \geq -2x+4$

$\small 3x \geq -2x-3$

$\small 5x \geq -3$

$\small x\geq -\frac{3}{5}$

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Example Question #5 : How To Find The Solution To An Inequality With Multiplication

We have x^2-4<0 , find the solution set for this inequality.

Possible Answers:

x>2, x<-2

-2<x<2

x>-2

x=0

x<2

Correct answer:

-2<x<2

Explanation:

$x^2-4<0 \Rightarrow x^2<4 \Rightarrow -2<x<2$

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Example Question #2 : How To Find The Solution To An Inequality With Multiplication

Fill in the circle with either $<$ , $>$ , or $=$ symbols:

$(x-3)\circ\frac{x^2-9}{x+3}$ for $x\geq 3$ .

Possible Answers:

$(x-3)> \frac{x^2-9}{x+3}$

$(x-3)=\frac{x^2-9}{x+3}$

The rational expression is undefined.

None of the other answers are correct.

$(x-3)< \frac{x^2-9}{x+3}$

Correct answer:

$(x-3)=\frac{x^2-9}{x+3}$

Explanation:

$(x-3)\circ\frac{x^2-9}{x+3}$

Let us simplify the second expression. We know that:

$(x^2-9)=(x+3)(x-3)$

So we can cancel out as follows:

$\frac{x^2-9}{x+3}=\frac{(x+3)(x-3)}{(x+3)}=x-3$

$(x-3)=\frac{x^2-9}{x+3}$

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Example Question #151 : Algebra

What value must take in order for the following expression to be greater than zero?

$\frac{3}{k}-\frac{5}{7}$

Possible Answers:

Correct answer:

Explanation:

is such that:

$\frac{3}{k}-\frac{5}{7}>0$

Add $\frac{5}{7}$ to each side of the inequality:

$\frac{3}{k}>\frac{5}{7}$

Multiply each side of the inequality by :

$\frac{21}{k}>5$

Multiply each side of the inequality by :

21>5k

Divide each side of the inequality by :

$k< \frac{21}{5}$

You can now change the fraction on the right side of the inequality to decimal form.

$k<\frac{21}{5}=\frac{20}{5}+\frac{1}{5}= 4.2$

The correct answer is , since k has to be less than 4.2 for the expression to be greater than zero.

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Example Question #152 : Algebra

Give the solution set of this inequality:

$|-4x+ 17| \ge 67$

Possible Answers:

[-12.5, 21]

The set of all real numbers

[-21, 12.5]

$(-\infty, -12.5 ] \cup [21, \infty )$

$(-\infty, -21 ] \cup [12.5, \infty )$

Correct answer:

$(-\infty, -12.5 ] \cup [21, \infty )$

Explanation:

The absolute value inequality

$|-4x+ 17| \ge 67$

can be rewritten as the compound inequality

$-4x+ 17 \le - 67$ or $-4x+ 17 \ge 67$

Solve each inequality separately, using the properties of inequality to isolate the variable on the left side:

$-4x+ 17 \le - 67$

Subtract 17 from both sides:

$-4x+ 17 - 17 \le - 67 - 17$

$-4x \le - 84$

Divide both sides by , switching the inequality symbol since you are dividing by a negative number:

$-4x \div (-4) \ge - 84 \div (-4)$

$x \ge 21$ ,

which in interval notation is $[21, \infty )$

The same steps are performed with the other inequality:

$-4x+ 17 \ge 67$

$-4x+ 17- 17 \ge 67 - 17$

$-4x \ge 50$

$-4x \div (-4) \le 50 \div (-4)$

$x \le -12.5$

which in interval notation is $(-\infty, -12.5 ]$ .

The correct response is the union of these two sets, which is

$(-\infty, -12.5 ] \cup [21, \infty )$ .

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Example Question #153 : Algebra

Find the maximum value of f(x,y) , from the system of inequalities.

$y\geq 2$

$4x+5\geq y+3$

$1\leq x\leq5$

f(x,y)=3x+3y

Possible Answers:

Correct answer:

Explanation:

First step is to rewrite $4x+5\geq y+3$

$4x+5\geq y+3$

$4x+2\geq y$

Next step is to find the vertices of the bounded region. We do this by plugging in the x bounds into the equation. Don't forgot to set up the other x and y bounds, which are given pretty much.

The vertices are

(1,2)

(5,2)

(1, 7)

(5, 22)

Now we plug each coordinate into f(x,y) , and what the maximum value is.

(1,2)=3(1)+3(2)=9

(5,2)=3(5)+3(1)=21

(1, 7)=3(1)+3(7)=25

(5, 22)=3(5)+3(22)=81

So the maximum value is

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SAT Math : How to find the solution to an inequality with multiplication

Study concepts, example questions & explanations for SAT Math

All SAT Math Resources

Example Questions

Example Question #1 : How To Find The Solution To An Inequality With Multiplication

Example Question #3 : How To Find The Solution To An Inequality With Multiplication

Example Question #181 : Equations / Inequalities

Example Question #5 : How To Find The Solution To An Inequality With Multiplication

Example Question #2 : How To Find The Solution To An Inequality With Multiplication

Example Question #151 : Algebra

Example Question #152 : Algebra

Example Question #153 : Algebra

All SAT Math Resources

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