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seraphim [82]
2 years ago
5

An equation in the form ax2+bx+c=0 is solved by the quadratic formula. The solution to the equation is shown below.x=−7±√ "572"

What are the values of a, b, and c in the quadratic equation?
A: a= 1, b= -7, c = -2
B: a = 1, b= 7, c = -2
C: a = 2, b = -7, c = -1
D: a = 2, b = 7, c = -1
Mathematics
2 answers:
jolli1 [7]2 years ago
5 0

Answer:

B: a = 1, b= 7, c = -2

Step-by-step explanation:

<u>Quadratic Formula</u>

x=\dfrac{-b \pm \sqrt{b^2-4ac} }{2a}\quad\textsf{when}\:ax^2+bx+c=0

Given:

x=\dfrac{-7\pm\sqrt{57}}{2}

Comparing the terms of the given x-value with those of the quadratic formula:

\dfrac{-b \pm \sqrt{b^2-4ac} }{2a}=\dfrac{-7\pm\sqrt{57}}{2}

Therefore:

  • 2a=2 \implies a=1
  • b = 7
  • b^2-4ac=57

Using the found values of a and b to solve for c:

\implies b^2-4ac=57

\implies (7)^2-4(1)c=57

\implies 49-4c=57

\implies -4c=57-49

\implies -4c=8

\implies c=-2

In summary:   a = 1,  b = 7,  c = -2

\implies x^2+7x-2=0

Therefore, <u>option B</u> is the correct solution.

harina [27]2 years ago
4 0

Question has errors in typing that 572 should be √57/2

Because if it's 572 then 2a=1 so

  • a=1/2

Also

  • -7=1/2b
  • b=-7(2)
  • b=-14

c also comes different

If it's like what I said

then

  • 2a=2
  • a=1

and

  • -b=-7
  • b=7

By putting values

  • c=-2

Option B can be correct

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6 0
3 years ago
The length,AB of the rectangular lot is 1 foot less than two times its width, BC. If the perimeter of the rectangular lot 394 fe
r-ruslan [8.4K]

Answer:

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Step-by-step explanation:

we know that

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where

AB is the length

BC is the width

we have

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substitute equation B and equation C in equation A

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Answer:

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Step-by-step explanation:

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arrange the scores in increasing order;

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mean = (54+87+96+120+123)/5 =480/5 =96

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Answer:

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Step-by-step explanation:

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