If a = 6 and b = 2, what is the value of the following expression? (a + b)^3 - 3ab(a + b)

2 answers:

7 0

Pemdas
sub them

(6+2)³-3(6)(2)(6+2)
parenthasees simplify
(8)³-3(6)(2)(8)
exponents
512-3(6)(2)(8)
multiply
512-18(2)(8)
512-36(8)
512-288
244

Nimfa-mama [501]3 years ago

3 0

The value would 223. all that needs to be done is substitute 6 for a and 3 for b.

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Solve the following system of equations using elimination: -x+5y=8 And 3x+7y=-2

djyliett [7]

Answer:

x=-3, y=1. (-3, 1).

Step-by-step explanation:

-x+5y=8

3x+7y=-2

----------------

3(-x+5y)=3(8)

3x+7y=-2

--------------------

-3x+15y=24

3x+7y=-2

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22y=22

y=22/22

y=1

-x+5(1)=8

-x+5=8

-x=8-5

-x=3

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6 0

3 years ago

Use elimination method to solve 5x+y=-10 7x-3y=-36

k0ka [10]

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Let's multiply the first equation by 3. (As you can see y's coefficient in the first one is 1 and in the second one is -3 , we will multiply the first equation by 3 so when we add the equations their sum will be 0)

$3\cdot (5x+y)=3\cdot -10\\ \\ 15x+3y=-30$

Now let's add this new equation and our second equation.

$7x-3y=-36\\ \\ 15x+3y=-30\\ \\ (15x+3y)+(7x-3y)=(-30)+(-36)\\ \\ 15x+7x+3y-3y=-30-36\\ \\ 22x=-66\\ \\ x=\frac { -66 }{ 22 } \\ \\ x=-3$

We found x=-3

Now let's plug x's value in one of the equations to find y's value.

$x=-3\\ \\ 5x+y=-10\\ \\ 5\cdot -3+y=-10\\ \\ -15+y=-10\\ \\ y=-10+15\\ \\ y=5$

So we found y=5

Solution ;

(-3, 5)

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3 years ago

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podryga [215]

P = a + b + c

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3 years ago

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