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4 years ago

Simplify x + x2 + 2x2 – 3x.

Mathematics

1 answer:

german4 years ago

6 0

All you have to do it combine like terms and your answer is simplified :)
$x+ x^{2} +2 x^{2} -3x$
$3x^2-2x$

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Choose a system and make a case for why you would

Elenna [48]

Answer:

The method of solving "by substitution" works by solving one of the equations (you choose which one) for one of the variables (you choose which one), and then plugging this back into the other equation, "substituting" for the chosen variable and solving for the other.

Step-by-step explanation:

3 0

3 years ago

Pls help, I’ll give you brainly

wel

I think 6 and -8, I am not too positive

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3 years ago

X ^ (2) y '' - 7xy '+ 16y = 0, y1 = x ^ 4

nignag [31]

Standard reduction of order procedure: suppose there is a second solution of the form $y_2(x)=v(x)y_1(x)$ , which has derivatives

$y_2=vx^4$
${y_2}'=v'x^4+4vx^3$
${y_2}''=v''x^4+8v'x^3+12vx^2$

Substitute these terms into the ODE:

$x^2(v''x^4+8v'x^3+12vx^2)-7x(v'x^4+4vx^3)+16vx^4=0$
$v''x^6+8v'x^5+12vx^4-7v'x^5-28vx^4+16vx^4=0$
$v''x^6+v'x^5=0$

and replacing $v'=w$ , we have an ODE linear in $w$ :

$w'x^6+wx^5=0$

Divide both sides by $x^5$ , giving

$w'x+w=0$

and noting that the left hand side is a derivative of a product, namely

$\dfrac{\mathrm d}{\mathrm dx}[wx]=0$

we can then integrate both sides to obtain

$wx=C_1$
$w=\dfrac{C_1}x$

Solve for $v$ :

$v'=\dfrac{C_1}x$
$v=C_1\ln|x|+C_2$

Now

$y=C_1x^4\ln|x|+C_2x^4$

where the second term is already accounted for by $y_1$ , which means $y_2=x^4\ln x$ , and the above is the general solution for the ODE.

4 0

3 years ago

Brett says that -4 x -5 = 4 x 5. evaluate Brett's claim in the space below

arlik [135]

Answer:

Brett's statement is true

Step-by-step explanation:

A negative times a negative will always equal a positive number.

If you see two negative numbers being multiplied together, you can ignore the negative signs and treat them both like positive numbers.

-4 x -5 = 20

4 x 5 = 20

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3 years ago

HELPPPP MEEE PLEASEEEE

Scrat [10]

The Answer Is B)...................

4 0

4 years ago