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Thepotemich [5.8K]
4 years ago
8

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

Mathematics
2 answers:
SCORPION-xisa [38]4 years ago
7 0

This can also be explained as D on edg :)

____ [38]4 years ago
6 0

Answer:

x = (1 + sqrt(253))/14 or x = (1 - sqrt(253))/14

Step-by-step explanation:

Solve for x:

7 x^2 = x + 9

Subtract x + 9 from both sides:

7 x^2 - x - 9 = 0

x = (1 ± sqrt((-1)^2 - 4×7 (-9)))/(2×7) = (1 ± sqrt(1 + 252))/14 = (1 ± sqrt(253))/14:

Answer: x = (1 + sqrt(253))/14 or x = (1 - sqrt(253))/14

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The perimeter of a square is given as 12x plus 20 write two different expressions to represent its perimeter for one way factors
Reika [66]

Given: 12x +20

factor out a two: 2(6x +10)
factor out a four: 4(3x+5)
factor out 3/4: 3/4(9x +15)
factor out 1/2: 1/2(6x +10)

Hint: think of Multiples of 12 and 20

Hope this helps!
6 0
3 years ago
Safety by-laws state that for a ladder to be stable, the angle the base of the ladder makes with the ground should be between 70
tatiyna

Cos(angle) = adjacent/hypotenuse

Cos(angle) = 1.5/10

Angle = arccos(1.5/10)

Angle = 81.37 degrees

Although the angle is close, it is over the 80 degrees, so the inspector should be concerned.

5 0
3 years ago
Round 35,894 to the nearest thousand.
-BARSIC- [3]
35,894 rounded to the nearest thousand is 36,000.
4 0
4 years ago
Read 2 more answers
On monday, johnny had $30 in his lunch account. On Friday, he had $15 in his account.
puteri [66]

Answer:

Im a little confused as to what the question is

Step-by-step explanation:

I believe that maybe your question was, "how much money is the lunches at the school?" if so.. I can help.

If he spent $15 for 5 days, and we are assuming he had lunch every day....

$15 divided by 5 equals $3.

The school lunches are $3.

3 0
3 years ago
The perimeter of a rectangular field is 84 yards. The ratio of the length to the width is 2:1. What are the length, width and ar
Ivenika [448]

Given:

  • the perimeter of a rectangular field is 84 yards
  • the ratio of the length to the width is 2:1

To find:

  • the length
  • the width
  • the area

Answer:

Let's assume that the length is 2x and the width is 1x.

We know that the formula to find the perimeter of a rectangle is as follows:

Perimeter = 2 × (Length + Width)

Substituting the values that we have, into the formula above,

84 = 2 × (2x + 1x)

84 = 2 × 3x

84/2 = 3x

42 = 3x

x = 42/3

x = 14

Since we know the value of 'x', let's use it to find the length and the width.

Length = 2x = 2 × 14 = 28

Width = 1x = 1 × 14 = 14

Since we now know the length and the width, let's find the area of the rectangle.

The formula to find the area of a rectangle:

Area = Length × Width

Substituting the values we have into the formula,

Area = 28 × 14

Area = 392

Therefore, the area of the rectangle is 392 square yards.

Hope it helps. :)

4 0
3 years ago
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