All categories

3 years ago

For the equation x2 + 2x − 8 = 0, what is the sum of the solutions?

Mathematics

1 answer:

Katen [24]3 years ago

5 0

Answer:

-2

Step-by-step explanation:

x^2 + 2x − 8 = 0

What 2 numbers multiply to -8 and add to 2

4*-2 = -8

4-2 = 2

(x+4) (x-2)=0

Using the zero product property

x+4 =0 x-2=0

x+4-4 =0-4 x-2+2=0+2

x = -4 x=2

We want the sum of the solutions

-4+2 = -2

You might be interested in

Your friend adds (2.5*10^9) and (5.3*10^8) . Is your friend correct?

Klio2033 [76]

Answer:

the correct answer would be 3030000000

Step-by-step explanation:

2500000000+530000000=3030000000

4 0

2 years ago

What is this answer 9 x -12=

Mariulka [41]

I hope this picture helps answer your question

8 0

3 years ago

Read 2 more answers

What is the advantage of using scientific names, instead of common names?

Aleksandr-060686 [28]

Answer:

the scientific name is the same name around the world and if you use common names they are different around the world

Step-by-step explanation:

8 0

3 years ago

What properties cannot be used in a proof

forsale [732]

I am certain the answer is C. Algebra properties are used in proofs. Postulates are definitely used. And definitions are explanations. So, it is C.

5 0

3 years ago

a village having a population of 4000, requires 150 litres of water per head per day. it has a tank measuring 20m x 15m x 6m. fo

allochka39001 [22]

The water will last for 3 days

Solution:

Given that, village having a population of 4000, requires 150 litres of water per head per day

Let us first find the volume of tank

The tank measuring 20m x 15m x 6m

Length = 20 m

Breadth = 15 m

Height = 6 m

$volume\ of\ tank = length \times breadth \times height$

$Volume\ of\ tank = 20 \times 15 \times 6 = 1800$

Thus volume of tank is 1800 cubic meter

From given,

Water required per person per day = 150 liters

Therefore, water required for 4000 people per day is:

$\rightarrow 4000 \times 150 = 600000 \text{ liters }$

Convert to meters

$600000 \text{ liters } = 600000 \times \frac{1}{1000}\ m^3\\\\600000 \text{ liters } = 600\ m^3$

How many days will the water of this tank last?

$\text{Number of days water will last } = \frac{\text{volume of tank}}{\text{total water required per day}}$

$\text{Number of days water will last } = \frac{1800}{600} = 3$

Thus the water will last for 3 days

5 0

2 years ago