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BigorU [14]
3 years ago
9

What is the discriminant of the polynomial below 2x2 + 5x - 8?

Mathematics
2 answers:
mihalych1998 [28]3 years ago
7 0

Answer:

The discriminant of the given polynomial is 89.

Step-by-step explanation:

The given polynomial is

P(x)=2x^2+5x-8            .... (1)

If a polynomial is defined as

P(x)=ax^2+bx+c            .... (2)

then the discriminant of the polynomial is

D=b^2-4ac

From (1) and (2), we get

a=2,b=5,c=-8

The discriminant of the given polynomial is

D=(5)^2-4(2)(-8)

D=25+64

D=89

Therefore the discriminant of the given polynomial is 89.

larisa [96]3 years ago
3 0
The discriminant is 89
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4x-y=20 and -2x-2y=10
lara31 [8.8K]

You can use Substitution to solve this problem:


4x-y=20

-y=-4x+20

y=4x-20


Now you have two equations, and you use the first one to substitute into the second one.


y=4x-20     and     -2x-2y=10


-2x-2(4x-20)=10

-2x-8x+40=10

-10x+40=10

-10x=-30

-x=-3

x=3


Now that we have figured out what x is, we can substitute x in to one of the equations to figure out y.


4x-y=20       x=3

4(3)-y=20

12-y=20

-y=8

y=-8



<em><u>So your answer would be x=3 and y=-8</u></em>

6 0
3 years ago
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4 0
3 years ago
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What is the value of the expression below when z = 4?<br> 10z - 3
sergey [27]

Answer:

Your correct answer is 37

Step-by-step explanation:

Evaluate for z = 4

(10)(4)−3

(10)(4)−3

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7 0
3 years ago
Find the number, if 3 1/3 of it is 10
Ugo [173]

Answer:

3

Step-by-step explanation:

You want a number that if it is multiplied by 3 1/3 the result will be 10. Let the number be x

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10/3 * x = 10                          Multiply by 3/10

(10/3)*x * 3/10 = 10 * 3/10     Combine

x = 10*3 / 10                          Simplify

x = 30/10 = 3

6 0
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What problem do you set up to find x and y
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You can use y=mx+b or x-1x/y-1y
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