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2 years ago

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Question 1 of 10

2 answers:

jok3333 [9.3K]2 years ago

7 0

Answer: $\Large\boxed{-x^3-9x^2}$

<em>Hi there! By my calculation, I got the answer above. However, it doesn't fit any one of the answer choices. I am not sure if I am totally correct, but I have been double-checking my answers. Please let me know whether it's the answer choices mistaken or I am wrong so that I could modify my answer if necessary.</em>

Step-by-step explanation:

<u>Given expression</u>

- (3x³ + x²) +2 (x³ - 4x²)

<u>Expand parenthesis by the distributive property</u>

= -3x³ - x² + 2x³ - 8x²

<u>Combine like terms</u>

= -3x³ + 2x³ - x² - 8x²

$\Large\boxed{=-x^3-9x^2}$

Hope this helps!! :)

Please let me know if you have any questions

Anna11 [10]2 years ago

6 0

Answer:

B. -x³ - 9x².

Step-by-step explanation:

- (3x³ + x²) +2 (x³ - 4x²)

= -3x³ + 2x³ - x² - 8x²

= -x³ - 9x²

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G<br> What is the value of f(x) when X=-3?<br> f(x)=-2x-3<br> f-3)=

Black_prince [1.1K]

Answer:

f(-3)=3

Step-by-step explanation:

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5 0

3 years ago

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Determine an expression for dy<br> dx given that x = sin3<br> (t)andy = cos3<br> (t)

shtirl [24]

Answer:

$\frac{dy}{dx} =-\sqrt[3]{\frac{y}{x} }$

Step-by-step explanation:

Recall that using the chain rule we can state:

$\frac{dy}{dt} =\frac{dy}{dx}*\frac{dx}{dt}$

and therefore solve for dy/dx as long as dx/dt is different from zero.

Then we find dy/dt and dx/dt,

Given that

$x=sin^3(t)\\dx/dt = 3 sin^2(t)* cos(t)$

And similarly:

$y=cos^3(t)\\dy/dt=-3\,cos^2(t)*sin(t)$

Therefore, dy/dx can be determined by the quotient of the expressions we just found:

$\frac{dy}{dx} =\frac{dy/dt}{dx/dt} =\frac{-3\,cos^2(t)*sin(t)}{3\,sin^2(t)*cos(t)} =-\frac{cos(t)}{sin(t)}$

now notice that we can find $cos(t) = \sqrt[3]{y}$ from the expression for y,

and $sin(t) = \sqrt[3]{x}$ from its expression for x.

Therefore dy/dx can be written in terms of x and y as:

$\frac{dy}{dx} =-\frac{cos(t)}{sin(t)}=-\sqrt[3]{\frac{y}{x} }$

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vovikov84 [41]

Answer:

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Step-by-step explanation:

Hope I helped!

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3 years ago

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grin007 [14]

Answer:

x= -5

Step-by-step explanation:

-3x + 25 = 40

you want to put x terms on one side, numbers on another side

subtract 25 on both sides

-3x = 15

divide both sides by -3

x= -5

please hit the heart button :)

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3 years ago

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Julli [10]

Answer:

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Step-by-step explanation:

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