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Mrrafil [7]
3 years ago
15

10) 3(n + 3) - 9 = 15 solve for n​

Mathematics
2 answers:
den301095 [7]3 years ago
8 0

Answer:

n=5

Step-by-step explanation:

We can first expand the 3(n+3) into 3n + 3*3. The equation now looks like this. 3n+9-9=15. 9-9=0, so now it is just 3n=15. We divide both sides by 3, and get n=5.

Tasya [4]3 years ago
3 0

Answer:

n = 5

Step-by-step explanation:

3(n + 3) - 9 = 15

Add 9 to each side

3(n + 3) - 9+9 = 15+9

3(n+3) = 24

Divide each side by 3

3/3(n+3) = 24/3

n+3 = 8

Subtract 3 from each side

n+3-3 = 8-3

n = 5

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Simplify (x3 +  3x2 + 5x – 4) –  (3x3 – 8x2 – 5x + 6)

The first thing I have to do is take that "minus" sign through the parentheses containing the second polynomial. Some students find it helpful to put a "1" in front of the parentheses, to help them keep track of the minus sign.

Here's what the subtraction looks like, when working horizontally:

(x3 + 3x2 + 5x – 4) – (3x3 – 8x2 – 5x + 6)

(x3 + 3x2 + 5x – 4) – 1(3x3 – 8x2 – 5x + 6)

(x3 + 3x2 + 5x – 4) – 1(3x3) – 1 (–8x2) – 1(–5x) – 1(6)

x3 + 3x2 + 5x – 4 – 3x3 + 8x2 + 5x – 6

x3 – 3x3 + 3x2 + 8x2 + 5x + 5x – 4 – 6

–2x3 + 11x2 + 10x –10

And here's what the subtraction looks like, when going vertically:

x

3

−(3x

3

​

 

+3x

2

−8x

2

​

 

+5x

−5x

​

 

−4

+6)

​

​

In the horizontal addition (above), you may have noticed that running the negative through the parentheses changed the sign on each and every term inside those parentheses. The shortcut when working vertically is to not bother writing in the subtaction sign or the parentheses; instead, write the second polynomial in the second row, and then just flip all the signs in that row, "plus" to "minus" and "minus" to "plus".

\

x

3

–3x

3

−2x

3

​

 

+3x

2

+8x

2

+11x

2

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+5x

+5x

+10x

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−4

–6

−10

​

​

Either way, I get the answer:

–2x3 + 11x2 + 10x – 10

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Step-by-step explanation:

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Step-by-step explanation:

solution.

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Answer:

A


Step-by-step explanation:


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Step-by-step explanation:

"hope this helps"

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