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Agata [3.3K]
4 years ago
8

Which expression is equal to (x+7)(−5x²+12x−2)?

Mathematics
1 answer:
Alekssandra [29.7K]4 years ago
5 0

Answer:

-5x^3-23x^2+82x-14

Step-by-step explanation:

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Answer:

  • x = 30°
  • DB = 26
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Step-by-step explanation:

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<h3>Q4</h3>

m∠AEB = 3x

m∠AEB = 90°

  • 3x = 90° ⇒ x = 30°
<h3>Q5</h3>

AE = 3x - 2

EC = 2x + 3

  • AE = EC
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  • 3x - 2x = 3 + 2
  • x = 5

DB = EC = 2(AE) = 2(3*5 - 2) = 2(13) = 26

<h3>Q6</h3>

<u>AD and BC are the sides, which are equal</u>

  • 2x - 1 = 5x - 13
  • 5x - 2x = 13 - 1
  • 3x = 12
  • x = 4

AD = BC = AB = DC =  2*4 - 1 = 7

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