Question

Find the sum and choose the correct answer.

2n3 + 4n2 - 7 and -n3 + 8n - 9
-n3 - 4n2 - 8n - 16
n3 + 4n2 + 8n - 16
n3 + 4n2 + 8n + 16
3n3 + 4n2 + 8n - 2

Answer 1

Add the like terms

Answer 2

\[(2n^3 + 4n^2 - 7) + (-n^3 + 8n - 9)\]
Combine the like terms!
2n^3 + -1n^3 = 1n^3 = n^3
So as head start I'll tell you that it'll begin with n^3

Answer 3

ow solve the rest by yourself and remember that 4n^2 and 8n cannot be combined!

Answer 4

*now

Answer 5

2n3 + 4n2 - 7 +( -n3 + 8n - 9)
=(2n^3-n^3)+4n^2+8n+(-7-9)

Answer 6

nw try.

Answer 7

ok um ok im not sure

Answer 8

i hate algebra

Answer 9

I do too don't worry! I'm glad I already finished with it this year:)

Ok, Your are going to keep the +4n^2 + 8n the way they are:
n^3 + 4n^2 + 8n
-7 + (-9) = -16
so your equation is:
\[n^3 + 4n^2 + 8n - 16\]

Answer 10

Which is option B :) I hope this helps! If you don't understand it let me know:)

Answer 11

ok thank you

Answer 12

im getting it i think

Answer 13

Soon you will understand it better...I took algebra 1 this year and hated it but after you get to more difficult lessons with Algebra this will seem easier:)

Answer 14

ok

Answer 15

thank you


much