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Ber [7]
3 years ago
11

Which equation shows the quadratic formula used correctly to solve 7x2 = 9 + x for x?

Mathematics
2 answers:
abruzzese [7]3 years ago
4 0
The equation should be 7x^2 -x-9=0
Mashutka [201]3 years ago
4 0

Answer:

The equation x=\frac{-(-1)\pm \sqrt{(-1)^2-4(7)(-9)}}{2(7)} shows the quadratic formula used correctly to solve the given equation.

Step-by-step explanation:

If a quadratic equation is defined as ax^2+bx+c=0, then the quadratic formula is

x=\frac{-b\pm \sqrt{b^2-4ac}}{2a}

The given equation is

7x^2=9+x

Subtract 9 and x from both the sides.

7x^2-x-9=0

Here, a=7, b=-1 and c=-9.

Substitute  a=7, b=-1 and c=-9 in the quadratic formula.

x=\frac{-(-1)\pm \sqrt{(-1)^2-4(7)(-9)}}{2(7)}

Therefore the equation x=\frac{-(-1)\pm \sqrt{(-1)^2-4(7)(-9)}}{2(7)} shows the quadratic formula used correctly to solve the given equation.

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igomit [66]

Answer: They have xylem vessels and phloem vessels

Step-by-step explanation:

7 0
2 years ago
Gordon types 3,300 words in 50 minutes. Find the unit rate.
Doss [256]

Answer:

Step-by-step explanation:

All you need o divide 3,300 by 50

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÷     50

--------------

66

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5 0
3 years ago
A polynomlal has been factored, as SHOWI Deluw.
Tom [10]

Answer:

The zeros are 6,-5,9

Step-by-step explanation:

The factored form of the polynomial is given as:

f(x) = (x - 6)(x + 5)(x - 9)

To find the zeros of this function, we set f(x)=0 and solve for x.

(x - 6)(x + 5)(x - 9) = 0

This implies that:

(x - 6) = 0 \: or \: (x + 5) = 0 \: or \: (x - 9) = 0

We solve for x to get:

x  = 6 \: or \: x  =  -  5  \: or \: x =  9

The zeros are 6,-5,9

3 0
3 years ago
What are the missing angles? What is the relationship between the measures of supplementary angles?
goldenfox [79]

Answer:

6=100°

8=80°

7=100°

9=80°

Step-by-step explanation:

If 6 is 100°

in a straight line theres 180 degrees

180-100=80°

8 is 80°

opposite 6 to 7 there are parallel corresponding angles meaning the angle opposite it will be the same. 8 with 9.

same with

5 0
3 years ago
What is the answer and how do you even do this please help​
Degger [83]

Answer:

Where is the question or problem that you want answered?

Step-by-step explanation:

I won't be of much help if I do not know what is it that you are asking help for.

7 0
3 years ago
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