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koban [17]
3 years ago
5

Solve x2 + 6x + 7 = 0.

Mathematics
2 answers:
Irina-Kira [14]3 years ago
4 0

Answer:

no solution

Step-by-step explanation:

use the box method to find out the factors

<u>                  |         7       </u>

     x^2      <u>|</u>

<u />

the top left and top right must multiply to 7x^2 and add up to 6x.

7 is multiplied together by 7 and 1, but only 7 and -1 can add up to 6x, so therefore there is no solution to this equation

another way is the quadratic equation

for an equation in form ax^2 +bx + c,

the quadratic equation states x = (-b <u>+</u> square root(b^2-4ac))/2a

in this case : x = -6 <u>+</u> (6^2 -28)^1/2 = -6<u>+</u> (some negative root that doesn't exist)

so x = no solution

docker41 [41]3 years ago
3 0

Answer:

x= -7/8

Step-by-step explanation:

8x + 7 = 0

8x + 7-7 = 0-7

8x=-7

8x/8x = -7/8

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Stela's piano lesson starts at 4:30. The lesson is 50 minutes long. When does her lesson end?
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Sixteen is 64% of what number?<br><br> A. 12<br> B. 48<br> C. 32<br> D. 25
NNADVOKAT [17]

Answer:

D. 25

Step-by-step explanation:

16 divided by 64% is 25

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2 years ago
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For the triangles ABC and MNP m∠A = m∠M, AB = 16, AC = 10, MN = 7, MP = 24. Find the ratio of the A△MNP and A△ABC .
Digiron [165]

Answer:

Ratio of area of triangles MNP and ABC is 1.05

Step-by-step explanation:

There are 2 triangles ABC and MNP.

We are given that ,m∠A = m∠M.

AB = 16 and AC = 10.

MN = 7 and MP = 24.

Area of a triangle ∝ Product of any two sides.

So area of triangle ABC ∝ 16\times 10

Area of triangle ABC = 160\times k ,

where k is a constant.

So area of triangle MNP ∝ 7 \times 24

Area of triangle MNP = 168\times k

So ratio of area of triangles = \frac{Area of MNP}{Area of ABC}

                                              = \frac{168}{160}

                                               = 1.05

3 0
3 years ago
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Martin wants to buy a new CD player. The
Soloha48 [4]

Answer:

$131.25

Step-by-step explanation:

Take the $175 price and divide it by 0.25, which is the decimal version of 25%. You should get 43.25 which is 25% of 175. Then subtract 43.25 from 175 to get the final answer of $131.25 for the CD player if Martin buys it on Wednesday.

7 0
3 years ago
What is the value of x?<br><br> Enter your answer in the box.<br><br> x =
ioda

Answer:

The answer of your question is: x = 5

Step-by-step explanation:

It's and isosceles triangle then ∠ A = ∠C

         

                            73 = 8y - 7

                            8y = 73 + 7

                            8y = 80

                            y = 80 / 8

                            y = 10

                   ∠  C = 8(10) -7

                   ∠  C = 73°

The sum of the internal angles in a triangle equals 180°

  ∠A + ∠B + ∠C = 180°

 73° + (6x + 4) + 73° = 180°                            Substitution

 6x + 4 = 180 - 73 - 73

 6x =34 - 4

 6x = 30

   x = 30 / 6

   x = 5

       

5 0
3 years ago
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