What a^2-2a-3=0 by solving equations by completing the square

Answers

Answer 1

Answer: $a^2-2a-3=0\na^2-2a+1-4=0\n(a-1)^2=4\na-1=-2 \vee a-1=2\na=-1 \vee a=3$

Related Questions

In order to be invited to tutoring or extension activities, a student's performance must be at least 20 points higher or lower than an average score. If the average score is 105, which inequality represents p, the scores for students who are eligible for tutoring or extension activities?a. 85 < p < 125 b. 85 ≤ p ≤ 125 c. p < 85 or p > 125 d. p ≤ 85 or p ≥ 125
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What precent of 14 is 4.34?

Answers

The answer is 31%.

Hope this helps.

X/100 x 14 = 4.34
X = 4.34 x 100/14
X= 31

What is the value of the ratio of the surface area to the volume of the right prism? A.
1.4

B.
1.07

C.
0.94

D.
0.7

length is 6
height is 3
width is 5

Answers

so first fin the area then surface area and the volume
volume=legnth times width times heigh ttimes width=3 times 5 times 6=90
volume=90
surface area=(2 times 3 times 5)+(2 times 3 times 6)+(2 times 5 times 6)=(2 times 15)+(2 times 18)+(2 times 30)=30+36+60=126

volume=90
surface area=126
radio fo surface area to volume
90:126
simplify and treat as fraction
5:7
since they area all decimals they expect us to divide
5/7=.714
the closest answer is D, 0.7

the answer is D 0.7

The answer is A. 1.4

In seven years, Gary will need $50,000 to pay his son's college tuition. If the interest rate is 10 percent, how much should he invest today?A.) $45,264.35
B.) $31,046.07
C.) $25,657.90

Answers

I'd say C, but not to sure...

Answer:

$25,657.90

Step-by-step explanation:

Edmentum

a tree is standing by the side of the building. 2/5th of the height of the tree is above the building level. the building is 9 metres high. what is the height of the tree?

Answers

If 2/5 of the tree is above the building, the other 3/5 must be down next to the building.

3/5(tree) = 9m

Multiply each side by 5/3 :

tree = (5/3) (9) = 15 meters

9 + ( 2 / 5 )*h = h =>45 + 2h = 5h => 45 = 3h => h = 45 / 3 => h = 15 metres.

Last month, Sunglass Kiosk had total sales of $9,720. Merchandise totaling $110 was returned. The goods that were sold cost Sunglass Kiosk $4,864. Operating expenses for the month were $1,180. What is the net income Sunglasss Kiosk will put on its income statement?

Answers

Given:
Total sales = 9,720
COGS = 4,864
returns = 110
Opex = 1180

(9720 - 4864)/4864 = 4,856/4864 = 0.9984
110 x 0.9984 = 109.82

Sales: 9,720 - 110 = 9,610
COGS: 4,864 - 109.82 = 4754.18

9,610 - 4754.18 - 1,180 = 3,675.82 net income.

Order the following from least to greatest.

Answers

Answer:

Hi there!

Your answer is:

-26/5 , -5.17 , √33 , 37/6

Step-by-step explanation:

-26/5 = -5.2

-5.17 = -5.17

✓33= 5.7

37/6 = 6.16

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