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denis-greek [22]

3 years ago

10

Jordan is kayaking upstream. The following equation model his speed: f(x) = 2x2 − 4x − 9, where x is Jordan's speed relative to

land. What is the domain of the function?
x ≥ 1
x ≤ −4
x ≥ −9
All real numbers

2 answers:

zalisa [80]3 years ago

8 0

Answer:

All real answers is the correct choice. D.

zhannawk [14.2K]3 years ago

4 0

Answer:

all real numbers .

Step-by-step explanation:

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Which choices are solutions to the following equation?<br> Check all that apply.<br> x2 -5x =<br> 4

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Step-by-step explanation:

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3 years ago

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4 years ago

Find the area and the perimeter of the shaded region

lyudmila [28]

Answer:

area: 41.04 cm² ; perimeter 35.8 cm

Step-by-step explanation:

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8 0

3 years ago

What are all of the real roots of the following polynomial? f(x) = x4 - 13x2 + 36

GREYUIT [131]

ANSWER

A. -3, -2, 2, and 3

EXPLANATION

The given polynomial function is,

$f(x) = {x}^{4} - 13 {x}^{2} + 36$

To find the real roots, we equate the function to zero to obtain;

${x}^{4} - 13 {x}^{2} + 36 = 0$

We can solve this equation as a quadratic equation in
${x}^{2}.$

Thus we rewrite the equation as,

$({x}^{2})^{2} - 13 {x}^{2} + 36 = 0$

We split the middle term to get,

$({x}^{2})^{2} - 9 {x}^{2} - 4 {x}^{2} + 36 = 0.$

We factor to get,

${x}^{2} ( {x}^{2} - 9) - 4( {x}^{2} - 9) = 0$

We factor to get,

$( {x}^{2} - 9)( {x}^{2} - 4) = 0$

Either

${x}^{2} - 9 = 0$
or

${x}^{2} - 4 = 0$

$x = \pm \sqrt{9} \: or \: x = \pm \sqrt{4}$
$x = \pm3 \: or \: x = \pm2$

$x=-3,-2,2,3$

The correct answer is A

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4 years ago

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