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3 years ago

20n^2+3n=12n^2+4identify a,b,c

Mathematics

1 answer:

masya89 [10]3 years ago

6 0

Answer:

a) a=8, b=3, c=-4

b) (-3 + $\sqrt{137}$ )/16, (-3 - $\sqrt{137}$ )/16)

c) roots in decimal form are 0.54 and -0.92

Step-by-step explanation:

a) 8n² + 3n - 4

b) (-3± $\sqrt{9+128}$ ) ÷ 16

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Evaluate the indefinite integral. integar x4/1 + x^10 dx

ivann1987 [24]

Answer:

$\int\ {\frac{x^4}{1 + x^{10}}} \, dx = \frac{1}{5}( \arctan(x^5)) + c$

Step-by-step explanation:

Given

$\int\ {\frac{x^4}{1 + x^{10}}} \, dx$

Required

Integrate

We have:

$\int\ {\frac{x^4}{1 + x^{10}}} \, dx$

Let

$u = x^5$

Differentiate

$\frac{du}{dx} = 5x^4$

Make dx the subject

$dx = \frac{du}{5x^4}$

So, we have:

$\int\ {\frac{x^4}{1 + x^{10}}} \, dx$

$\int\ {\frac{x^4}{1 + x^{10}}} \, \frac{du}{5x^4}$

$\frac{1}{5} \int\ {\frac{1}{1 + x^{10}}} \, du$

Express x^(10) as x^(5*2)

$\frac{1}{5} \int\ {\frac{1}{1 + x^{5*2}}} \, du$

Rewrite as:

$\frac{1}{5} \int\ {\frac{1}{1 + x^{5)^2}}} \, du$

Recall that: $u = x^5$

$\frac{1}{5} \int\ {\frac{1}{1 + u^2}}} \, du$

Integrate

$\frac{1}{5} * \arctan(u) + c$

Substitute: $u = x^5$

$\frac{1}{5} * \arctan(x^5) + c$

Hence:

$\int\ {\frac{x^4}{1 + x^{10}}} \, dx = \frac{1}{5}( \arctan(x^5)) + c$

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3 years ago

Please help! i need answers will mark brainleist answer

sesenic [268]

For the first one it's A.
Third one is, True
The last one is C,
This is all I know I hope I helped, sorry I couldn't with the others :(

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2 years ago

20n^2+3n=12n^2+4identify a,b,c​

20n^2+3n=12n^2+4identify a,b,c