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krok68 [10]
3 years ago
6

Simplify 2(-3n - 5) + 5n

Mathematics
2 answers:
Alenkasestr [34]3 years ago
7 0

EXPLANATION:

Use PEMDAS it will show u from where to start first and you will end up with the right result

PEMDAS : Parentheses, Exponents, Multiplication and Division, Addition and Subtraction

2(-3n-5) + 5n

distribute 2 in the parantheses

-6n-10+5n

-1n-10

lianna [129]3 years ago
6 0

Answer:

-1n-10

Step-by-step explanation:

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Calculate y as a function of x when dy/dx = 4x3 + 3x2 - 6x + 5
PtichkaEL [24]
Answer:
y = x⁴ + x³ - 3x² + 5x + C

======

Separable differential equations such as these ones can be solved by treating dy/dx as a ratio of differentials. Then move the dx with all the x terms and move the dy with all the y terms. After that, integrate both sides of the equation.

   \begin{aligned}&#10;\dfrac{dy}{dx} &= 4x^3 + 3x^2 - 6x + 5 \\&#10;dy &= (4x^3 + 3x^2 - 6x + 5) dx \\&#10;\int dy &= \int (4x^3 + 3x^2 - 6x + 5) dx &#10;\end{aligned}

In general (understood that +C portions are still there), 

   \int x^{m} = \dfrac{x^{m+1}}{m+1}

Note that ∫dy = y  since it is ∫1·dy = ∫y⁰ dy = y¹/(0+1) = y
For the right-hand side, we use the sum/difference rule for integrals, which says that

   \int \big[f(x) \pm g(x)\big]\, dx = \int f(x)\,dx \pm \int g(x) \, dx

Applying these concepts:

   \begin{aligned} &#10; \int dy &= \int (4x^3 + 3x^2 - 6x + 5) \, dx \\&#10;y &= \int 4x^3\,dx + \int 3x^2 \, dx - \int 6x\, dx + \int 5\, dx \\&#10;&= \frac{4x^4}{4} + \frac{3x^3}{3} - \frac{6x^2}{2} + 5x + C \qquad \text{(only one $C$ is needed)} \\&#10;&= x^4 + x^3 - 3x^2 + 5x + C&#10;\end{aligned}

The answer is y = x⁴ + x³ - 3x² + 5x + C
6 0
3 years ago
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