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Having trouble with the question!

Having trouble with the question!-example-1
User Shoen
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2 Answers

7 votes

Answer:

C)
6r^2-9r-6

Explanation:

Open the parentheses, you get:


-3r^2-2r-4+9r^2-7r-2

Then combine like terms:


-3r^2+9r^2=6r^2\\-2r-7r=-9r\\-4-2=-6\\

Then right as a polynomial:


6r^2-9r-6

So the answer would be C)

User Safex
by
8.0k points
13 votes

Answer:

6r² - 9r - 6

Explanation:

(-3r² - 2r - 4) - (-9r² + 7r + 2)

Multiply to remove the parenthesis:

(-3r² - 2r - 4) - (-9r² + 7r + 2)

1(-3r² - 2r - 4) - 1(-9r² + 7r + 2)

1(-3r²) +1(-2r) + 1(-4) + -1(-9r²) + -1(7r) + -1(2) <== remember that multiplying 2 negatives, makes a positive

-3r² - 2r - 4 + 9r² - 7r - 2

Combine any like terms:

-3r² - 2r - 4 + 9r² - 7r - 2

6r² - 9r - 6 <== make sure that your answer is in Standard form (in decreasing degrees)

Hope this helps!

User Tiago Vaccari
by
8.3k points

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