All categories

2 years ago

What are the zeros of f(x) x^2-x-20

Mathematics

2 answers:

PolarNik [594]2 years ago

8 0

Answer:

x = - 4, x = 5

Step-by-step explanation:

To find the zeros equate f(x) to zero, that is

x² - x - 20 = 0

Consider the factors of the constant term (- 20) which sum to give the coefficient of the x- term (- 1)

The factors are - 5 and + 4, since

- 5 × 4 = - 20 and - 5 + 4 = - 1, thus

(x - 5)(x + 4) = 0 ← in factored form

Equate each factor to zero and solve for x

x + 4 = 0 ⇒ x = - 4

x - 5 = 0 ⇒ x = 5

EastWind [94]2 years ago

6 0

Answer:

x= -4 and x= 5

Step-by-step explanation:

You might be interested in

7*z^(1/2)-3=2*z??? solve??/

Hoochie [10]

Answer:

Z €{9, i can right a fraction but on top is 9 below is 4}

Step-by-step explanation:

3 0

2 years ago

A company will lease office space in win buildings the annual cost is 21.75 per square foot in the first building and 17 per squ

brilliants [131]

What is your question?
I cannot see it

5 0

3 years ago

In 2010 a family membership in a country club cost $18,000 if this cost increased $475 each year since 2010, then how much will

kvasek [131]

Answer:

21,800

Step-by-step explanation:

Because 475 x 8 equals 3800 you add 3800 to 18,000 and get 21,800

4 0

2 years ago

U have an initial amount of $55 in a saving acc each week after 6 weeks the account holds $133 write an equation

marishachu [46]

You are doing 133 divided by 6 to give you 55

3 0

2 years ago

The rate of change of the volume of a snowball that is melting is proportional to the surface area of the snowball. Suppose the

Alisiya [41]

Answer:

According to the passage, we have the next equation:

$\frac{dV}{dt} = \frac{4}{3}\pi*3*r^{2}*\frac{dr}{dt} = K*(4\pi*r^{2} )$

where "K" is a proportional constant

Leaving at the end with the next equation:

$\frac{dr}{dt} = K$

Integrating the equation, we have:

$r=K*t+C$

where "C" is a constant

Then, we have the 2 conditions for the problem:

1) t=0 → r=10

Replacing in the equation, we have C = 10

2) t=5 → r=8

Replacing in the equation, we have K = -0.4

Finally, the time which the snowball will be completely melted will be when r = 0. So replacing in the equation

$0=-0.4*t+10$

t = 25 minutes

6 0

2 years ago