Find the sum and choose the correct answer.

2n 3 + 4n 2 - 7 and -n 3 + 8n - 9

-n3 - 4n2 - 8n - 16
n3 + 4n2 + 8n - 16
n3 + 4n2 + 8n + 16
3n3 + 4n2 + 8n - 2

Question

Find the sum and choose the correct answer.

2n 3 + 4n 2 - 7 and -n 3 + 8n - 9

-n3 - 4n2 - 8n - 16
n3 + 4n2 + 8n - 16
n3 + 4n2 + 8n + 16
3n3 + 4n2 + 8n - 2

photon336 · Answer

Group like terms together then combine like terms. 

$$2n^{3}-n^{3}+4n^{2}+8n-7-9$$

weemzman · Answer

@Photon336 thanks! i got B

photon336 · Answer

no problem that's the idea behind it. you can perform operations on like terms like add and subtract like terms etc

weemzman · Answer

@Photon336 Select the correct difference.

-3z 7 - (-5z 7)

2z7
8z14
-2z7
2z

I got 2z7

photon336 · Answer

$$-3z^{7}-(-5z^{7})$$

photon336 · Answer

you're correct