Question

Having trouble with the question!

Answer 1

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)

Answer 2

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!