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Sloan [31]
3 years ago
7

What is the value of the discriminant, b2 − 4ac, for the quadratic equation 0 = x2 − 4x + 5, and what does it mean about the num

ber of real solutions the equation has? The discriminant is −4, so the equation has 2 real solutions. The discriminant is −4, so the equation has no real solutions. The discriminant is 35, so the equation has 2 real solutions. The discriminant is 35, so the equation has no real solutions.
Mathematics
2 answers:
Sedaia [141]3 years ago
6 0
Discriminant, D = b² - 4ac

x² - 4x + 5 = 0  comparing to  ax² + bx + c = 0

a = 1, b = -4, c = 5

D = b² - 4ac = (-4)² - 4*1*5 = 16 - 20 = -4

In taking the square root of the discriminant of -4, √-4 = 2i = Not Real. So:

Discriminant is -4, so the equation has no real roots.

The second option is correct.   
34kurt3 years ago
4 0
D = 16-20 = -4 

what mean exactly the second choice is right so the quadratic has no real solutions 
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What is the value of 7x-9y when x=1 and y=8?
julsineya [31]
It would be - 65

7 x 1 = 7
9 x 8 = 72

7 - 72 = - 65

hope this helps you
4 0
3 years ago
Read 2 more answers
Naglakad si Ruben ng 900 sentimetro samantalang si Jaime ay naglakad ng
Gelneren [198K]

Sagot:

100 cm

Hakbang-hakbang na paliwanag:

Kung ganoon :

Distansya na sakop ng Ruben = 900 centimetri

Distansya na sakop ng Jamie = 10 metro

Pagko-convert sa centimeter:

100 cm = 1 m

x cm = 10 m

Paggamit ng multiplikasyon ng krus:

x = 100 * 10

x = 1000 cm.

Dahil dito Distansya ni Jamie = 1000 cm

Distansya sa pagitan ng Jamie at Ruben;

1000 cm - 900 cm = 100 cm

3 0
3 years ago
Penelope drove 27 kilometers. Which expression finds the distance she drove in centimeters? Use the metric table to help answer
vovikov84 [41]

Answer:

Step-by-step explanation:

1km=1000 m

1 m=100 cm

1 km=1000×100=100000 cm

27 km=100000×27=2,7 00,000 cms

4 0
3 years ago
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In the opening scene of the movie Raiders of the Lost Ark, Indiana Jones replaces a golden statue with a bag of sand. The platfo
chubhunter [2.5K]

Answer:

1920π

Step-by-step explanation:

First, you need to find the volume of the statue in terms of pi.

Volume of cylinder formula:

V=πr²h

V=π4²15

V=π16×15

V=240π

Then, you need to find the mass of the statue.

Mass:

Mass= density × volume

Mass=20×240π

Mass=4800π

Now, you need to find the volume. Since the sand has to weigh the same as the statue, the mass is going to stay the same. To find the volume you need to do:

V=mass of sand/density

V=4800π/2.5

That gives you your answer:

1920π

Note: I had to do the exact same problem on Khan Academy. This is right.

3 0
3 years ago
Pablo runs 1.5 miles on his first day of training for a road race the next day he increases his distance run by 0.5 miles the da
Sati [7]
So, he runs 1.5 then adds 0.5 every day,
1.5
(1.5+0.5)+1.5=x
(2.0+0.5)+x=z
2.5+0.5+z=y
etc.
Why, they want to know the total distance he runs, so thats why you add x,y,z to the end, and you add 2.0+0.5 because he adds 0.5 every dat Plus the other day's miles jogged
8 0
3 years ago
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