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3 years ago

Which of these is a trinomial\ A. x+2y^2-7 B. 5xy C. 2x-7 D. 2x^3-7y^3

Mathematics

2 answers:

Vladimir [108]3 years ago

4 0

The answer is A

i hope this helped

tamaranim1 [39]3 years ago

3 0

A is the answer to this

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The general solution of 2 y ln(x)y' = (y^2 + 4)/x is

Sav [38]

Replace $y'$ with $\dfrac{\mathrm dy}{\mathrm dx}$ to see that this ODE is separable:

$2y\ln x\dfrac{\mathrm dy}{\mathrm dx}=\dfrac{y^2+4}x\implies\dfrac{2y}{y^2+4}\,\mathrm dy=\dfrac{\mathrm dx}{x\ln x}$

Integrate both sides; on the left, set $u=y^2+4$ so that $\mathrm du=2y\,\mathrm dy$ ; on the right, set $v=\ln x$ so that $\mathrm dv=\dfrac{\mathrm dx}x$ . Then

$\displaystyle\int\frac{2y}{y^2+4}\,\mathrm dy=\int\dfrac{\mathrm dx}{x\ln x}\iff\int\frac{\mathrm du}u=\int\dfrac{\mathrm dv}v$

$\implies\ln|u|=\ln|v|+C$

$\implies\ln(y^2+4)=\ln|\ln x|+C$

$\implies y^2+4=e^{\ln|\ln x|+C}$

$\implies y^2=C|\ln x|-4$

$\implies y=\pm\sqrt{C|\ln x|-4}$

4 0

3 years ago

3raise power minus 4

balandron [24]

Answer:

1/81

Step-by-step explanation:

7 0

3 years ago

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If 4x + 8x + 12x + 16x is equal to 5 + 10 + 30 + 40 then what is the value of x

zloy xaker [14]

4x+8x+12x+16x=5+10+30+40

4x+8x+12x+16x= 85

40x=85

x= 85/40

x=2.125

7 0

3 years ago

A)250cm =______ mm. b)5000m = ____ km. c) 200km =______cm.

Liono4ka [1.6K]

Answer:

a = 2500mm

b = 5km

c = 2e+7

Step-by-step explanation:

6 0

3 years ago

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Divide 7/15 by 3/5 A. 7/9 B. 75/21 C. 21/75 D. 7/25

hodyreva [135]

7/15 ÷ 3/5 =
= 7/15 * 5/3 =
= 7/3 * 1/3 = (after simplifying)
= 7/9

Correct answer: A

Just keep in mind that dividing one fraction by another fraction is as much as multiplying the same fraction by an inverse of the second one.

4 0

3 years ago

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