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almond37 [142]
3 years ago
14

The solutions to the equation 2x^2+x-1=2 are x=-3/2 or x= ?

Mathematics
1 answer:
Phoenix [80]3 years ago
3 0

Answer:

1

Step-by-step explanation:

2x^2 + x -1 = 2

2x^2 + x-1-2 = 0

2x^2 + x -3 = 0

2x^2 -2x + 3x-3 = 0

2x(x-1) + 3(x-1) = 0

(2x + 3)(x-1) = 0

2x + 3 = 0

or x-1 = 0

x = -3/2 or 1

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Please help me!!!!!!!!!
kiruha [24]

Answer:

Step-by-step explanation:

Using the equation of line

y - y_1 = m(x - x_1)

y = mx + C

First first the slope of the equation

y = 9x - 4

Note: if two lines are perpendicular, their slope will be negative reciprocal

Slope = 9, but because it is perpendicular

m = -1/9

Using the equation

y - y_1 = m(x - x_1)

With the point (-9,-17)

x_1 = -9

y_1 = -17

y - (-17) = -1/9(x - (-9)

y + 17 = -1/9(x + 9)

y = -1/9(x + 9) - 17

Open the bracket.

y = (-x -9)/9 - 17

Lcm is 9

y = -x -9 - 153 / 9

y = -x - 162 / 9

Let's separate

y = -x/9 - 162/9

y = -x/9 - 18

y = -1/9x - 18

Therefore, the equation of the line is y = -1/9x - 18

5 0
3 years ago
What is 82,694 +3899
andrew11 [14]

Answer:

86, 593

Step-by-step explanation:

          1  1  1

      8 2 6 9 4

+        3 8 9 9

_____________

        8 6 5 9 3

5 0
4 years ago
Marcus wants to use a model to determine the difference
grigory [225]

Electron transfer theory describes the parameters which control the rate at which an electron is transferred from one atom or molecule to another.

<h3>What was the basic principle of Marcus theory?</h3>
  • In theoretical chemistry, Marcus theory is a theory originally developed by Rudolph A. Marcus, starting in 1956, to explain the rates of electron transfer reactions – the rate at which an electron can move or jump from one chemical species.
  • Marcus' method (also referred to as Marcus's method and Method of Marcus) is a structural analysis method which was designed to design concrete slabs with rectangular, orthogonal shapes. It represents an adaptation of the strip method.
  • Marcus Hush theory (M-H theory) was developed in 1956 by Rudolph A. Marcus which explains the fundamentals of the redox/ electron transfer reactions in terms of the rate of jumping/moving an electron from oxidant species (electron donor) to the reductant (electron acceptor).
  • The "Marcus Inverted Region" (MIR) is that part of the function of rate constant versus free energy where a chemical reaction becomes slower as it becomes more exothermic.

We want to see how we can model the difference: -8 - 3 + 3

The correct option is D:

"add 3 positive counters and 3 negative counters"

We know that Marcus starts with 8 negative counters, corresponding to the first term in our difference.

Now, let's study the math of our expression.

-8 - 3 + 3

Remember that we can perform the operation in any order we want, so we can write this as:

-8 + (-3 + 3)

Notice that the thing inside the parentheses is equal to zero, so we have:

- 8 + (-3 + 3) = -8

So to not change the value, we add 3 and we subtract 3.

Now if we have 8 negative counters, and we want to add 3 positive counters and not change the value, then we also need to add 3 negative counters to "cancel" the 3 positive counters we added.

Then the correct option is D.

To learn more about Marcus refer to,

brainly.com/question/23140234

#SPJ1

8 0
1 year ago
10 marbles are placed in a bag and two of them are randonly drawn.
Gelneren [198K]
The problem does not say anything about how many of the marbles are yellow but if you put the first one back in the bag then it is an independent probability and each one would be the same individual probability. Since the problem doesn't say and I don't know if you have it somewhere else, I'll do it as an example.

Let's say there were 6 of the 10 marbles were yellow. So the probability of the first one is 6/10 and so is the second one 6/10. To find the total probability you multiply them together 6/10*6/10=36/100=9/25

Hope that helps. If you can tell me how many yellow there are I will show the work for the specific problem.
4 0
3 years ago
Hello again im stuck on this expand question -5(3z-2)
lions [1.4K]

Answer:

Step-by-step explanation:

-5(3z - 2) = -5*3z - (-5)*2

               = -15z + 10

6 0
3 years ago
Read 2 more answers
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