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Vesna [10]
3 years ago
13

What are the roots of the polynomial equation? x^2 + x -72 =0

Mathematics
1 answer:
Ulleksa [173]3 years ago
3 0
There are many ways you can go. I'm going to start out factoring the whole thing.
(x+9)(x-8) = 0
seperate these into two different equations.
x+9 = 0     and       x-8 = 0
x= -9                      x=8
 Make sure you check it by substituting. Sometimes you might have to reject an answer. In this case you don't. Therefore, 8 and -9 are your roots!

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At a pet shop 5 herbals out of 15 have black hair and 3 mice out of 9 have black hair. Are the ratios the Same?
dmitriy555 [2]

Answer: Yes.

Step-by-step explanation:

First ratio

5 : 15

Simplify (divide both sides by 5)

1 : 3

Second Ratio

3 : 9

Simplify (divide both sides by 3)

1 : 3

8 0
3 years ago
The Gotemba walking trail up Mount Fuji is about 9km long. Walkers need to return from the 18km walk by 8pm. Toshi estimates tha
stiv31 [10]

Answer:

Toshi must begin his walk at 11:00 AM in order that he can return by 8:00 PM.

Step-by-step explanation:

Since the Gotemba walking trail up Mount Fuji is about 9km long, and walkers need to return from the 18km walk by 8pm, if Toshi estimates that he can walk up the mountain at 1.5km / h on average, and down at twice that speed , these speeds taking into account meal breaks and rest times, to determine what is the latest time he can begin his walk so that he can return by 8pm the following calculation must be performed:

Climb: 1.5 km / h

Descent: 2 x 1.5 km / h = 3 km / h

Climb: 9 km / 1.5 km / h = 6 hours

Descent: 9km / 3 km / h = 3 hours

Total: 9 hours

8 PM = 20:00

20:00 - 09:00 = 11:00

Thus, Toshi must begin his walk at 11:00 AM in order that he can return by 8:00 PM.

3 0
3 years ago
What is six ninths minus one third
san4es73 [151]

Answer:  1/3

Step-by-step explanation:

4 0
3 years ago
Read 2 more answers
Solve the system of equation
kherson [118]

Answer:

The answer to your question is:

x = -10; y = 8

Step-by-step explanation:

Solve equations by elimination method                          

                                              2x + 3y = 4    (1)

                                               x + 2y = 6    (2)

Multiply 2 by -2

                                              2x + 3y = 4

                                             -2x - 4y = -12

                                                    -y = -8

                                                     y = 8

Substitute y in (2)

                                             x + 2(8) = 6

                                            x = 6 - 16

                                            x = -10

8 0
3 years ago
Help me please I’m almost done ayyayayayatayayy
leva [86]

Answer:

4(5j+3j) is 32j

4(3j) is 12j

5j+3j+9j is 17j

Step-by-step explanation:

5 0
2 years ago
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