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4 years ago

28 POINTS BRAINLIEST

Mathematics

1 answer:

Arisa [49]4 years ago

7 0

Answer:

The roots can be seen from the graphs as - 4 and +4

The equation is :

x² - (sum of roots) + (product of roots)

Equation is x² -16

I hope you got it

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PLEASE HELP!!! A system of linear equations is shown below.

MAXImum [283]

Answer:

The value of the variable x is -2 and the value of the variable y is -7.

Step-by-step explanation:

The substitution method consists of:

Solve for an unknown in one of the equations, which will be a function of the other unknown .
In the other equation that is not used, the same unknown is replaced by the expression obtained in step 1.
Solve for the only remaining unknown, obtaining the numerical value of an unknown.
Substitute the cleared unknown in step 3 for its numerical value in the equation obtained in step 1.
Operate to obtain the numerical value of the other unknown.

In this case, you have the system of equations:

$\left \{ {{2*x-3*y=17} \atop {-3*x+y=-1}} \right.$

Isolating the variable y from the second equation:

y= -1 +3*x

Replacing this expression in the first equation:

2*x-3*( -1 +3*x)= 17

Solving:

2*x -3*(-1)-3*3*x= 17

2*x +3 -9*x= 17

2*x -9*x= 17 -3

(-7)*x= 14

x= 14÷(-7)

x= -2

Now, replacing the value of x in the expression y = -1 + 3 * x you get:

y= -1 +3*(-2)

Solving:

y= -1 -6

y= -7

So, the value of the variable x is -2 and the value of the variable y is -7.

5 0

3 years ago

What is the mathematical induction of 1+3+5+...+(2n-1)=n^2

Lena [83]

Let $S(n)$ be the statement that

$1+3+5+\cdots+(2n-1)=\displaystyle\sum_{k=1}^n(2k-1)=n^2$

Check to see that $S(n)$ holds for $n=1$ :

$\displaystyle\sum_{k=1}^1(2k-1)=1=1^2\implies S(1)\text{ is true}$

Now suppose that $S(N)$ is true, and use that assumption to show that $S(N+1)$ must also be true. When $n=N+1$ , you have

$\displaystyle\sum_{k=1}^{N+1}(2k-1)=\sum_{k=1}^N(2k-1)+2(N+1)-1$
$=N^2+2(N+1)-1$
$=N^2+2N+1$
$=(N+1)^2$

and so $S(N+1)$ is also true, thus proving the statement is true for all $n$ .

6 0

4 years ago

Please answer this question!! 30 points and brainliest!

12345 [234]

Answer:

2 out of 8 or 25 %

Step-by-step explanation:

8 0

3 years ago

Choose the answer.

Tasya [4]

1. B she started with 36 photographs,
22 = b - 18 + 13 - 9
b = 22 + 18 - 13 + 9
b = 36

I translated it into an equation, so I would say C, but since B is the only one with the right answer...

2. A
78 - 5 = 73
73 × 365 = 26645

3. D

4. D

5. A
40 × 86 = 3440

6 0

3 years ago

Read 2 more answers

83 and one third percent as a fraction

Dmitriy789 [7]

83 1/3% = (83 1/3)/100
 = ((3*83 + 1)/3)/100
 = (250/3)/100 
 = 250/300 
 = (5*50)/(6*50) = (5/6)*(50/50)
83 1/3% = 5/6

6 0

3 years ago