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

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Example Questions

Example Question #221 :Algebra

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

Possible Answers:

(n-1)²> n

16n²- 1 = 0

n²< 2n

n²< n

|n²- 1| > 1

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

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

Possible Answers:

-1

All of the answers choices are valid.

-2

-3

-4

Correct answer:

-1

Explanation:

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

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Example Question #21 :Inequalities

Solve forx

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

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 #7 :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:

-2<x<2

x>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 #31 :Inequalities

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 #21 :Inequalities

What is the greatest value ofthat makes

$-45 \leq \frac{x - 7}{- 6} \leq - 22$

a true statement?

Possible Answers:

277

228

Correct answer:

277

Explanation:

Find the solution set of the three-part inequality as follows:

$-45 \leq \frac{x - 7}{- 6} \leq - 22$

$-45 \cdot (-6) \geq \frac{x - 7}{- 6} \cdot (-6) \geq - 22 \cdot (-6)$

$270 \geq x-7 \geq 132$

$270 + 7 \geq x-7 + 7 \geq 132 + 7$

$27 7 \geq x \geq 139$

The greatest possible value ofis the upper bound of the solution set, which is 277.

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Example Question #22 :Inequalities

What is the least value ofthat makes

$-45 \leq \frac{x - 7}{- 6} \leq - 22$

a true statement?

Possible Answers:

139

125

Correct answer:

139

Explanation:

Find the solution set of the three-part inequality as follows:

$-45 \leq \frac{x - 7}{- 6} \leq - 22$

$-45 \cdot (-6) \geq \frac{x - 7}{- 6} \cdot (-6) \geq - 22 \cdot (-6)$

$270 \geq x-7 \geq 132$

$270 + 7 \geq x-7 + 7 \geq 132 + 7$

$27 7 \geq x \geq 139$

The least possible value ofis the lower bound of the solution set, which is 139.

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

Give the solution set of the inequality:

$-7 \leq - \frac{3}{4}x < -4$

Possible Answers:

$\left ( 5\frac{1}{3}, 9 \frac{1}{3} \right ]$

$\left [ - 5\frac{1}{4}, -3 \right )$

$\left (3, 5 \frac{1}{4} \right ]$

$\left [- 9\frac{1}{3},- 5\frac{1}{3} \right )$

None of the other responses gives the correct answer.

Correct answer:

$\left ( 5\frac{1}{3}, 9 \frac{1}{3} \right ]$

Explanation:

Divide each of the three expressions by $-\frac{3}{4}$ , or, equivalently, multiply each by its reciprocal, $-\frac{4}{3}$ :

$-7 \leq - \frac{3}{4}x < -4$

$-7 \cdot \left ( - \frac{4}{3} \right ) \geq - \frac{3}{4}x \cdot \left ( - \frac{4}{3} \right ) > -4 \cdot \left ( - \frac{4}{3} \right )$

$\frac{28}{3} \geq x > \frac{16}{3}$

$5 \frac{1}{3} < x \leq 9 \frac{1}{3}$

or, in interval form,

$\left ( 5\frac{1}{3}, 9 \frac{1}{3} \right ]$ .

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

Give the solution set of the following inequality:

$32 < \frac{x - 4}{5} < 42$

Possible Answers:

(164, 214)

(148, 188)

None of the other responses gives the correct answer.

(180, 230)

(133,173)

Correct answer:

(164, 214)

Explanation:

$32 < \frac{x - 4}{5} < 42$

$32\cdot 5 < \frac{x - 4}{5} \cdot 5< 42 \cdot 5$

160 < x - 4 < 210

160+ 4< x - 4 + 4< 210 + 4

164 < x < 214

或者,在间隔符号, (164, 214) .

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Example Question #25 :Inequalities

Which of the following numbers could be a solution to the inequality 3x<x<-2x ?

Possible Answers:

$\frac{1}{2}$

Correct answer:

Explanation:

In order for a negative multiple to be greater than a number and a positive multiple to be less than that number, that number must be negative itself. -4 is the only negative number available, and thus the correct answer.

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

Study concepts, example questions & explanations for PSAT Math

All PSAT Math Resources

Example Questions

Example Question #221 :Algebra

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

Example Question #21 :Inequalities

Example Question #7 :How To Find The Solution To An Inequality With Multiplication

Example Question #31 :Inequalities

Example Question #21 :Inequalities

Example Question #22 :Inequalities

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

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

Example Question #25 :Inequalities

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