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zhuklara [117]
3 years ago
15

2|3x - 2|= 14 how would you solve this absolute value equation?

Mathematics
2 answers:
IRINA_888 [86]3 years ago
7 0

Answer:

  • x = 3
  • x = - 5/3

Step-by-step explanation:

  • 2|3x - 2|= 14
  • |3x - 2|= 7

1) 3x - 2 ≥ 0 ⇒ 3x ≥ 2 ⇒ x ≥ 2/3

  • 3x - 2 = 7
  • 3x = 9
  • x = 3  is valid root as 3 ≥ 2/3

2) 3x - 2 < 0 ⇒ 3x < 2 ⇒ x < 2/3

  • - (3x - 2) = 7
  • 3x - 2 = -7
  • 3x = -5
  • x = -5/3  is valid root as -5/3 < 2/3
Feliz [49]3 years ago
6 0

Answer: 2. |3x-2|= 14

|3x-2|=2.7/2

|3x-2|=7

x∈ {3,-5/3

Step-by-step explanation: \frac{5}{3}

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3 years ago
From a ship, the angle of elevation of a point, A, at the top of a cliff is 21°. After the ship has sailed 2,500 feet directly t
fredd [130]

Answer:

10701.97 feet.

Step-by-step explanation:

Refer the attached figure

The angle of elevation of a point, A, at the top of a cliff is 21° i.e. ∠ACB = 21°

The ship has sailed 2,500 feet directly toward the foot of the cliff i.e. CD = 2500 feet.

Then the angle of elevation becomes 47° i.e.∠ADB = 47°

Let BD be x

So, BC = BD+DC=x+2500

Let the height of the cliff be h feet.

In ΔABD

We will use trigonometric ratios

tan\theta = \frac{Perpendicular}{Base}

tan47^{\circ} = \frac{AB}{BD}

1.072= \frac{h}{x}

1.072x=h    ---a

In ΔABC

We will use trigonometric ratios

tan\theta = \frac{Perpendicular}{Base}

tan21^{\circ} = \frac{AB}{BC}

0.869 = \frac{h}{x+2500}

0.869(x+2500) =h

0.869x+2172.5 =h   -----b

Equate a and b

0.869x+2172.5 =1.072x

2172.5 =1.072x-0.869x

2172.5 =0.203x

\frac{2172.5}{0.203}=x

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Thus the height of the cliff is 10701.97 feet.

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3 years ago
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