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Basile [38]
3 years ago
12

Carly solved a quadratic equation by completing the square, but her work has errors. Identify the first error in Carly's work.

Mathematics
1 answer:
Savatey [412]3 years ago
8 0

Answer:

Her first error was adding the wrong number to both sides. Instead of 4², it should be 2²

Step-by-step explanation:

When completing the square, the number that needs to be added to both sides is (b/2)²

In this problem, b is 4. So, Carly should have added 2² to both sides, but she added 4² instead.

So, her first error was adding 4² to both sides instead of 2²

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The equations were multiplied by constants and added together to determine that the value of x in the system of equations is –20
Misha Larkins [42]

Answer:

Step-by-step explanation:

Given:

1. 1/5x - 1/3y = -1

2. -3/4x +1/3y = 12

Multiplying equation 1 by 15 and equation 2 by 12

3. 3x - 5y = -15

4. -9x + 4y = 144

and then Solving both equations simultaneously, since x = -20 as stated in the question and by confirmation,

Using equation 3 or 4 to solve for y,

3(-20) - 5y = -15

-5y = 60 - 15

y = 45/-5

= -9

y = -9

8 0
3 years ago
Kathy is baking 3 apple pies. Each pie requires 2 3/4 pounds apples. Apples cost $2.49 a pound. About how much will Kathy spend
salantis [7]

<em>Answer</em><em>:</em>

<em>$</em><em>2</em><em>0</em><em>.</em><em>5</em><em>5</em>

<em>Explanation</em><em>:</em>

  • 1apple pie needs 2/3/4pounds of apple
  • 1pound cost $2.49
  • 2/3/4 = ?
  • 2/3/4 ×2.49
  • =$6.85 for one pie
  • For 3 pies ,
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  • = $20.55
8 0
3 years ago
Giving braililist 1+2
vitfil [10]

Answer:

\huge\boxed{Answer\hookleftarrow}

1 + 2  \\  = 3

3 0
3 years ago
A company makes Citi bikes. 95% (i.e., 0.95) pass final inspection. Suppose that 5 bikes are randomly selected.
Phoenix [80]

Answer:

Hi myself Shrushtee.

Step-by-step explanation:

Given,

p=0.95

n=5

1-p = q =1-0.95=0.05

a)Probability that exactly 4 of these 5 sports bikes pass final inspection =0.2036

b)Probability that less than 3 of these 5 sports bikes pass final inspection =0.0012

Please mark me as brainleist

8 0
3 years ago
Help me for 40 points. Thank you very much
Lilit [14]

Answer:

answer is 11/16 plz give me brainlist

8 0
3 years ago
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