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Andrews [41]
2 years ago
10

100 POINTS multiply: (2x+1)(x^2-3x-2)

Mathematics
2 answers:
denis-greek [22]2 years ago
7 0

Answer:

2x^3-5x^2-7x-2

Step-by-step explanation:

1)  Expand by distributing sum groups.

2x(x^2-3x-2)+x^2-3x-2

2) Expand by distributing terms.

2x^3-6x^2-4x+x^2-3x-2

3) Collect like terms.

2x^3+(-6x^2+x^2)+(-4x-3x)-2

4) Simplify.

2x^3-5x^2-7x-2

Thanks!

- Eddie

Vladimir79 [104]2 years ago
6 0

Step-by-step explanation:

Sorry for writing BTS Army but I do lov* them all...

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Please help, thank you
solmaris [256]

Answer:

1.

8x + 6y = 28

9x + 3y = 39

Set to equal y.

8x + 6y = 28

6y = -8x + 28

y = -8/6x + 28/6

y = -4/3x + 14/3

9x + 3y = 39

3y = -9x + 39

y = -9/3x + 39/3

y = -3x + 13

Set equal to each other.

-4/3x + 14/3 = -3x + 13

Combine like terms.

5/3x = 25/3

Multiply by 3/5

x = 5

Plug x in.

y = -3(5) + 13

y = -15 + 13

y = -2

(5, -2)

2.

-2x - 9y = -3

-7x - 9y= -33

Set equal to y.

-2x - 9y = -3

-9y = 2x - 3

y = -2/9x + 3/9

y = -2/9x + 1/3

-7x - 9y= -33

-9y = 7x - 33

y = -7/9x + 33/9

y = -7/9x + 11/3

Set equal to each other

-2/9x + 1/3 = -2/9x + 1/3

0 = 0

infinitely many solutions

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