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3 years ago

How is this solved 2x²+5x+7=20

Mathematics

2 answers:

Angelina_Jolie [31]3 years ago

7 0

You’d use the quadratic formula:
X= -b +- √b^2-4ac
———————-
2a

And I attached your final answers

Sav [38]3 years ago

5 0

Answer:

you would have to use repletion

Step-by-step explanation:

2x^2+5x+7=20

-7 -7

2x^2+5x=13

/5 /5

2x^2+x=2.6

4+2x=2.6

-4 -4

2x=-1.4

/2 /2

x=-0.7

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Solution:

Let "x" be the number of multiple choice questions

Let "y" be the number of short answer questions

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Worth of 1 short answer question = 10 points

Ms. Lee wrote a test with 15 multiple choice short answer questions

Therefore,

number of multiple choice questions + number of short answer questions = 15

x + y = 15 -------- eqn 1

The maximum number of points possible on the test is 100

Therefore, we frame a equation as:

number of multiple choice questions x Worth of 1 multiple choice questions + number of short answer questions x Worth of 1 short answer question = 100

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3 years ago

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4 years ago

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klemol [59]

Answer:

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Step-by-step explanation:

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3 years ago

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Answer:

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Applying t- test:

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4 years ago

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1 year ago

How is this solved 2x²+5x+7=20​

How is this solved 2x²+5x+7=20