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Solve for $x$ . $\newline$ (x - 4)(x + 6) < 0 $\newline$ $\newline$ Write a compound inequality like 1 < x < 3 or like x < 1 or x > 3.

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Solve quadratic inequalities

Full solution

Q. Solve for

x

.

\newline

(x - 4)(x + 6) < 0

\newline

\newline

Write a compound inequality like

1 < x < 3

or like

x < 1

or

x > 3

.

Plot Zeros and Intervals: Plot the zeros on a number line and determine the intervals. The intervals are $(-\infty, -6)$ , $(-6, 4)$ , and $(4, \infty)$ .
Test Values in Inequality: Test a value from each interval in the inequality. $\newline$ Choose $x = -7$ for $(-\infty, -6)$ , $x = 0$ for $(-6, 4)$ , and $x = 5$ for $(4, \infty)$ .
Test $x = -7$ : Plug $x = -7$ into $(x - 4)(x + 6)$ .\(\newline\)( $-7 - 4$ )( $-7 + 6$ ) = ( $-11$ )( $-1$ ) > $0$ , so $(-\infty, -6)$ does not satisfy the inequality.
Test $x = 0$ : Plug $x = 0$ into $(x - 4)(x + 6)$ .(0 - 4)(0 + 6) = (-4)(6) < 0, so $(-6, 4)$ satisfies the inequality.
Test $x = 5$ : Plug $x = 5$ into $(x - 4)(x + 6)$ .(5 - 4)(5 + 6) = (1)(11) > 0, so $(4, \infty)$ does not satisfy the inequality.
Write Compound Inequality: Write the solution as a compound inequality. $\newline$ The solution is -6 < x < 4.

More problems from Solve quadratic inequalities

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s

\newline

|s| + 3 \geq 8

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Which compound inequality represents the value of

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\newline

(x - 1)(x + 1) > 0

\newline

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A particular company charges advertisers a one time cost of

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, in addition to

\$4.50

for every one thousand times an advertisement is shown on the company's webpage. An advertiser wants its ad to appear

M

thousand times on the webpage, but does not want to spend more than

\$5,000

. Which of the following inequalities best describes the situation?

\newline

\newline

500+4.50M\geq5,000

\newline

4.50+500M>5,000

\newline

500+4.50M\leq5,000

\newline

500+4.50M<5,000

Posted 7 months ago

Question

7x+1 < x+9

\newline

Which of the following best describes the solutions to the inequality shown?

\newline

1

\newline

x > \frac{4}{3}

\newline

x < \frac{4}{3}

\newline

x < 1

\newline

x < \frac{5}{3}

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Question

52-3x < -14

\newline

Which of the following best describes the solutions to the inequality shown?

\newline

1

\newline

x > -\frac{38}{3}

\newline

x > \frac{38}{3}

\newline

x < 22

\newline

x > 22

Posted 10 months ago

Question

5-3x > 2x+2

\newline

Which of the following best describes the solutions to the inequality shown?

\newline

1

\newline

x < \frac{7}{5}

\newline

x < 3

\newline

x < \frac{3}{5}

\newline

x > \frac{3}{5}

Posted 10 months ago

Question

Rani is a real estate agent. For each house she sells, she pays

\$ 100

in fees, but earns a commission of

1.8 \%

of the selling price of the house. Rani's total profit from a particular house is

\$ 4,580

p

represents the selling price of the house, which equation best models the situation?

\newline

1

\newline

0.018 p-100=4580

\newline

0.018 p+100=4580

\newline

(100-0.018) p=4580

\newline

(100+0.018) p=4580

Posted 8 months ago

Question

A commercial airplane that is

1

500

2

500

-mile journey is traveling at

450

knots in still air when it picks up a tailwind of

150

knots (in the same direction). If

h

is the number of hours remaining in the airplane's flight, which of the following equations best describes the situation?

\newline

1

\mathrm{knot}=1.15

miles per hour (mph)

\newline

1

\newline

1,500+690 h=2,500

\newline

1,500+600 h=2,500

\newline

1,500-600 h=2,500

\newline

1,500-690 h=2,500

Posted 7 months ago

Question

A weeping willow that is

15

feet in height grows to a maximum height of

35

y

years at a constant rate of

24

inches per year. Which of the following equations best describes this situation?

\newline

1

=12

\newline

1

\newline

35=15+2 y

\newline

35=15+24 y

\newline

35=15-2 y

\newline

35=15-24 y

Posted 10 months ago

Question

The gas mileage for a car is

23

miles per gallon when the car travels at

60

miles per hour. The car begins a trip with

13

gallons in its tank, travels at an average speed of

60

miles per hour for

h

hours, and ends the trip with

10

gallons in its tank. Which of the following equations best models this situation?

\newline

1

\newline

13-\frac{23 h}{60}=10

\newline

13-\frac{60 h}{23}=10

\newline

\frac{13-60 h}{23}=10

\newline

\frac{13-23 h}{60}=10

Posted 8 months ago

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