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o-na [289]
3 years ago
15

Solve the equation using the distributive property and properties of equality.

Mathematics
2 answers:
horsena [70]3 years ago
8 0

Answer:

a=8

Step-by-step explanation:

If we're using the distributive property, we should  first open parentheses by multiplying -5*a and -5*3

-5*a= -5a

-5*3= -15

Now, we have the equation: -5a-15= -55

Add fifteen to both side:

-5a= -40

a=8

lubasha [3.4K]3 years ago
7 0

Answer:

a = 8

Step-by-step explanation:

-5(a + 3) = - 55

- 5a - 15 = - 55

55 - 15 = 5a

5a = 40

a = 40 : 5

a = 8

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When 3 dice are rolled what is the probability of getting a sum of 15?
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What number must be added to the expression below to complete the square x^2+8x-5=15
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General Formulas and Concepts:

<u>Pre-Alg</u>

  • Equality Properties

<u>Algebra I</u>

  • Completing the Square: b/2a

Step-by-step explanation:

<u>Step 1: Define expression</u>

x² + 8x - 5 = 15

<u>Step 2: Solve</u>

  1. Isolate <em>x</em> terms:                    x² + 8x = 20
  2. Complete the Square:        (x² + 8x + 16) = 20 + 16
  3. Simplify:                               (x + 4)² = 36
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