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Brrunno [24]
3 years ago
14

Factor using ac-method,  15y+6y²-21= ________

Mathematics
1 answer:
Sunny_sXe [5.5K]3 years ago
3 0
15y+6y^2-21=\\
6y^2+15y-21=\\
3(2y^2+5y-7)=\\
3(2y^2-2y+7y-7)=\\
3(2y(y-1)+7(y-1))=\\
3(2y+7)(y-1)

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Someone also help me with this one
Gre4nikov [31]

2m

I think it is because the down it is 8 m

so there is 6m it the top

so it should be

8-6=2

6 0
4 years ago
2 doctors is what percent of 25 doctors
bazaltina [42]
You can say:
2/25 = ?/100 
so ? is your percent and is equals to:
100*2/25 = 8% :)))
i hope this is helpful
have a nice day 
3 0
4 years ago
3b + 7b with b = 4 <br> Please answer :)
jeka57 [31]

Answer:

40

Step-by-step explanation:

Substitute the variable, x, with 4

3(4) + 7 (4)

Multiply

3(4)= 12

7(4)= 28

12 + 28 = 40

5 0
3 years ago
Angle and Kenny play online video games Angle buys 2software package and 3 months of game play Kenny buys 2 software packages an
Vsevolod [243]

Answer:

I got 29

Step-by-step explanation:

5 0
3 years ago
Solve the given differential equation by undetermined coefficients. y'' 4y = 7 sin(2x)
kherson [118]

The solution to the given differential equation is yp=−14xcos(2x)

The characteristic equation for this differential equation is:

P(s)=s2+4

The roots of the characteristic equation are:

s=±2i

Therefore, the homogeneous solution is:

yh=c1sin(2x)+c2cos(2x)

Notice that the forcing function has the same angular frequency as the homogeneous solution. In this case, we have resonance. The particular solution will have the form:

yp=Axsin(2x)+Bxcos(2x)

If you take the second derivative of the equation above for  yp , and then substitute that result,  y′′p , along with equation for  yp  above, into the left-hand side of the original differential equation, and then simultaneously solve for the values of A and B that make the left-hand side of the differential equation equal to the forcing function on the right-hand side,  sin(2x) , you will find:

A=0

B=−14

Therefore,

yp=−14xcos(2x)

For more information about differential equation, visit

brainly.com/question/18760518

8 0
2 years ago
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