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ladessa [460]
3 years ago
11

How do I solve this and check all the solutions?

Mathematics
2 answers:
ololo11 [35]3 years ago
5 0

Answer:

x=2

Step-by-step explanation:

√20-8x=x

2√5-2x=x (by simplfing redical expression)

4(5-2x)=x^2 (square both side)

20-8x=x^2

20-8x-x^2=0

-x^2-8x+20=0

x^2+8x-20=0

x=2

Note:There is a another answer x=-10 But it's wouldn't fit out with this equation

Andru [333]3 years ago
3 0

Answer:

x = 2

Step-by-step explanation:

(Square both sides)

20 - 8x = x^2

(Solve 20 - 8x = x^2)

x = 2 , x = 10

x = 10 is false, so the answer is x = 2.

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What is the circumference of a circle if the diameter is 6.4
melamori03 [73]
The answer is C I’m pretty sure, it makes the most sense
8 0
2 years ago
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The population of a city is 451,400. The population is expected to decrease at a rate of 3.2% each year.
blondinia [14]

Answer:

Find out the what function equation represents the population of the city after t years .

To prove

The population of a city is 451,400. The population is expected to decrease at a rate of 3.2% each year.

This can be represented by exponential decreasing function.

f(t) = a (1 - r)^{t}

Where a is the initial value.

r is the rate in decimal form

t is the time.

Here

a = 451,400

3.2 % is written in the decimal form.

= \frac{3.2}{100}

= 0.032

Put in the formula

f(t) = 451400 (1 - 0.032)^{t}

f(t) = 451400 (0.968)^{t}

Therefore the decrease in the population of the city after t years is represented by

f(t) = 451400 (0.968)^{t}



5 0
2 years ago
Read 2 more answers
Solve the quadratic equation by completing the square. x2+6x+7=0 First, choose the appropriate form and fill in the blanks with
kirill [66]

Answer:

x^2+6x-4=0 x^2+6x=4 x^2+6x+9=13 (x+3)(x+3)=13 x+3=+or-(13^1/2) x=-3+or-13^1/2

Step-by-step explanation:

sry if im wrong :< if im right, can i have brainliest? have a wonderful day/night :D

5 0
3 years ago
Hai công ty A và B cùng kinh doanh một mặt hàng. Xác suất để công ty A thua lỗ là 0,3; xác suất để công ty B thua lỗ là 0,2 và x
DENIUS [597]

Answer:

Ask in English then I can help u

4 0
2 years ago
Can someone give me the answer
Lelechka [254]
Hi,


The answer is D, (y = 8x)


Hope this helps.
r3t40

5 0
2 years ago
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