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2 years ago

For what value of k, -4 is a zero of polynomial x2-x-(2k+2)?

1 answer:

5 0

Hmm
well, um
if -4 is a zero then if we subsitute -4 for x, we should get 0

so
0=(-4)²-(-4)-(2k+2)
0=16+4-2k-2
0=18-2k
2k=18
divide by 2
k=9

k=9
the value k is 9

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For each function, do the following: a) state the name of the function, b) identify the independent and dependent variable, c) i

Lostsunrise [7]

Answer:

Given the function in the question

f(x) = |x-3| + 2

a) state the name of the function

Absolute value function

since it is similar to f(x) = |x|

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x = independent variable (input variable)

f(x) or y = dependent variable (output variable)

The variable which we assign the value we call the independent variable, and the other variable is the dependent variable, since it value depends on the independent variable.

c) identify the rule

A function is an equation that has only one answer for y for every x.

d) evaluate the function

given x = -5

f(-5) = |-5 - 3| + 2

= |-8| + 2

= 8 +2

= 10

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2 years ago

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erma4kov [3.2K]

4th option is correct.

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3 years ago

A helicopter leaves an airport and flies south at 180 mi/h. Thirty minutes later, an airplane leaves the airport and follows the

stira [4]

Answer:

36 minutes

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3 years ago

John has $4000 in his savings account.each month he withdraws $70 from his account which is the type of function that models thi

r-ruslan [8.4K]

Answer:

y = 4000 - 70x

Linear function.

Step-by-step explanation:

Let x = number of weeks.

In 1 week, he withdraws $70.

That means -70 in 1 week.

After the second week, he will have withdrawn 2 times $70, or

-70 × 2

After 3 week, he will have withdrawn -70 × 3

After x weeks, he will have withdrawn $70 × x,or simply -70x.

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2 years ago

Find the equation of the axis of symmetry.<br>equation of axis of symmetry:

sleet_krkn [62]

9514 1404 393

Answer:

x = -4

Step-by-step explanation:

The axis of symmetry is the vertical line through the vertex. The vertex is the turning point, or minimum, of the function. It is (x, y) = (-4, 0). The x-coordinate there is -4, so the equation of the axis of symmetry is ...

x = -4

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2 years ago