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3 years ago

Using factoring by difference of squares to solve the equation 4x^2-81=0.

Mathematics

1 answer:

LuckyWell [14K]3 years ago

5 0

Answer:

Step-by-step explanation:

−

Add

to both sides of the equation.

Divide each term by

and simplify.

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Take the square root of both sides of the equation to eliminate the exponent on the left side.

√

The complete solution is the result of both the positive and negative portions of the solution.

Tap for more steps...

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How do you do simplfi 32/100

poizon [28]

The reduced form of

$\frac{32}{100} = \frac{8}{25}$

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3 years ago

7x + 4 = 25, then x is equal to <br><br> a) 29/ 7 b) 100/7 c) 2 d/ 3

zvonat [6]

Answer:

d) 3

Step-by-step explanation:

7x+4=25

7x=21

X=3

3 0

3 years ago

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18)<br> i have to find the distance

astraxan [27]

Answer:

can you show us the problem

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3 years ago

f left parenthesis x right parenthesis equals 25 comma 000 left parenthesis 1 plus.025 right parenthesis to the power of x?

Oduvanchick [21]

Answer:

f(x) = 25,000 ( 1 + 0.025 )ˣ

Step-by-step explanation:

Given word problem becomes

f(x) = 25,000 ( 1 + 0.025 )ˣ

6 0

3 years ago

When an opinion poll calls landline telephone numbers at random, approximately 30% of the numbers are working residential phone

ioda

Answer:

Mean = 6

Standard Deviation = 4.2

Step-by-step explanation:

This is a binomial probability distribution problem.

The mean has formula:

$\mu = np$

The standard deviation has formula:

$\sigma=np(1-p)$

Where n is the number of calls [20]

p is the probability of success [30=0.3]

Let's put these into the formula:

$\mu=np\\\mu=(20)(0.3)\\\mu=6$

and

$\sigma=np(1-p)\\\sigma=(20)(0.3)(1-0.3)\\\sigma=(20)(0.3)(0.7)\\\sigma=4.2$

8 0

4 years ago