Question

Find the sum of the three expressions and choose the correct answer.

-8a^3b + 3a^2b^2 - 5
2 + 5a^2b^2
3a^3b + 7 - 9a^2b^2

Answer 1

Group like terms. For example:
-8a^3b + 3a^3b = ?
Can you do this?

Answer 2

i dont know

Answer 3

no

Answer 4

answers
-5a^3b - a^2b^2 + 2
-5a^3b + 8a^2b^2 + 4
-5a^3b - a^2b^2 + 4

Answer 5

Can you work out this example? -5x + 7x = ?

Answer 6

-2x

Answer 7

i think

Answer 8

-5x + 7x = 2x
Do you understand?

Answer 9

y positive not negative

Answer 10

Can you try this again
-8a^3b + 3a^3b = ?
Don't change 'a^3b', just focus on the leading numbers of each term

Answer 11

ok so you get -5

Answer 12

Yes, and including a^3b the answer is -5a^3b.
So now we have the first term of the answer.
To find the next term of the answer find this:
3a^2b^2 - 9a^2b^2 = ?

Answer 13

-6

Answer 14

Nearly right. But the full answer is -6a^2b^2. Now to get the second term of the answer we need to add 5a^2b^2
-6a^2b^2 + 5a^2b^2 = ?

Answer 15

-1a^2b^2

Answer 16

Correct! Now we just need to do the numbers to get the last term of the answer:
-5 + 2 + 7 = ?

Answer 17

4

Answer 18

Correct! Now we just gather our three terms for the answer, remembering that
-1a^2b^2 = -a^2b^2
-5a^3b -a^2b^2 +4 is the answer.

Answer 19

ok thank you

Answer 20

You're welcome. Good on you for perservering :)