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pav-90 [236]
3 years ago
15

2x² + 9 = - 7x how do i find an answer using the quadratic formula

Mathematics
1 answer:
jok3333 [9.3K]3 years ago
7 0

Answer:

(-7 ± i√(-23)) / 4

Step-by-step explanation:

Unless you have to show your work, you don't really have to use the quadratic formula unless it is unfactorable.

2x² + 9 = -7x    (Add 7x to both sides)

2x² + 7x + 9 = 0    ( The quadratic formula is (-b ± √(b^2 - 4ac))/2a )

A = 2

B = 7

C = 9

(-7 ± √(49 - 72))/4

= (-7 ± √(-23))/4    (Which simplifies to an imaginary answer, proving that this is, indeed, unfactorable)

= (-7 ± i√(-23))/4

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Where in the bible is there an indication of the value of pi what was the approximate value?
Morgarella [4.7K]
The Bible, a book that is considered the perfect word of a perfect god tells us what the value of Pi is. Let's see verse 1 Kings 7:23
 He also melted a sea of ​​ten cubits from one side to the other, perfectly round; Its height was five cubits, and a cord of thirty cubits encircled it.

 These are a list of specifications for the great temple of King Solomon, built about 950 BCE, and his interest here is that it gives a value of π = 3. If we divide 30 cubits between 10 cubits (which are the measures mentioned in written radical) gives us exactly 3.

 We know that the length of the circumference is calculated l = 2 · π · r; Since 2 · r is the diameter, it can also be said that

 circumference = diameter × π

 If we go back to what the Bible says, the diameter is 5 meters and the circumference of 15:

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 with which the value of π is 3.

 This calculation of Pi is a bad approximation to the real value. The figure of 3 in the Bible compared with the real one which is 3.1416 ... indicates an error of about 6%.
7 0
3 years ago
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Gemiola [76]

Answer: T(x) = 18x + 65

Step-by-step explanation:

T(x) = A(x) + B(x)

T(x) = 10x + 50 + 8x + 15             [Plug in the number for A(x) and B(x)]

T(x) = 10x + 8x+ 50 + 15

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8 0
2 years ago
How to do distributive property
enyata [817]

Answer: 4x+20


Step-by-step explanation:

Take the number outside the parentheses, and multiply it by each number inside it, one at a time.

then you simply just combine them.


4 0
2 years ago
Subject:Mathematics ​
posledela

Answer:

x=28°

Step-by-step explanation:

2x+3x-10+50=180

5x+40=180

5x=180-40

5x=140

x=140/5

x=28°

3 0
2 years ago
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Is the following inequality true : 4 <_ 4 ?
marissa [1.9K]

Answer:

Yes

Step-by-step explanation:

This is true because it is asking you if this is less than or EQUAL TO. 4 = 4, making it true.

8 0
2 years ago
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