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Dmitry_Shevchenko [17]
3 years ago
5

What is the discriminant of the quadratic equation 0 = –x2 4x – 2?

Mathematics
2 answers:
Molodets [167]3 years ago
4 0

Answer:

Step-by-step explanation:

Given is a quadratic equation of the form

-x^2+4x-2

WE know that for any quadratic equation of the form

ax^2+bx+c=0

the discriminant would be

b^2-4ac

The discriminant determines the nature of roots of the quadratic equation, namely, real, rational or equal roots.

Here we have for the given equation

discriminant = 4^2-4(-1)(-2)\\=16-8\\=8

Thus we have discriminant as positive but not perfect square

Hence roots would be distinct, irrational and real.

lyudmila [28]3 years ago
3 0
The answer is down the page under ANSWER. here is a quick explanation first.

okay, i assume your equation is actually like this:

minus x squared plus 4 x minus

note: the proper way to type this electronically is: -x^2 + 4x - 2.



The equation you gave is known as a quadratic equation.

if you think about it, the generic (general) way of writing this quadratic equation is:

ax^2 + bx + c


a, b and c are just numbers

eg.

2x^2 + 7x + 4

looking at the general equation above

a is 2
b is 7
c is 4

you can put negatives in as well, to find out a, b and c

eg

-2x^2 - 6x - 12


so, what is a b and c?

a is -2 (must say its negative)
b is - 6 (must say negative)
c is - 12 ( again, remember its a negative number)

ANSWER

IF YOU JUST WANT THE ANSWER.

THE DISCRIMINANT IS:

4 squared minus (4 times -1 times -2)
this is 16 - 8
solution of discriminant is 8


explanation:

so, now we cleared that up.
in any quadratic equation ( like the equation you gave), the discriminant is (in general)


b2 - 4ac

use this to solve it for any quadratic equation for the discriminant
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Step-by-step explanation:

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The cost of a shirt and a pair of pants is the same and is equal to $2. The correct option is B.

<h3>What is a solution to a system of equations?</h3>

For a solution to be the solution to a system, it must satisfy all the equations of that system, and as all points satisfying an equation are in their graphs, so solution to a system is the intersection of all its equation at a single point(as we need a common point, which is going to be the intersection of course)(this can be one or many, or sometimes none)

Let x represent the cost of a shirt, while y represent the cost of a pair of pants.

Given that Jake bought 2 shirts and 1 pair of pants for $6. Therefore, the equation that represents this situation is,

2x + y = 6 ..... equation 1

Also, Mike bought 1 shirt and 1 pair of pants for $4. Therefore, the equation that represents this situation is,

x + y = 4

Solve the equation for x,

x = 4 - y

Substitute the value of x in equation 1,

2x + y = 6

2(4 - y) + y = 6

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-y = -2

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Substitute the value of y in equation 1,

2x + y = 6

2x + 2 = 6

2x + 2 = 6

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Learn more about finding the solution graphically here:

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One hundred tickets, numbered 1, 2, 3, …, 100, are sold to 100 people for a drawing. Four different prizes are awarded, includin
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b). 1 way to give person 47 their prize

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    98 ways to give out the 3rd prize

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Answer:

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Step-by-step explanation:

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Let's assume:

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so there are 2 equation:

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