Question

Perform the operations.
(4.3a^2 + 1.6a − 4.3) − (2.7a^2 − 3.3a + 11.8)

Answer 1

add and subtract like terms. But first, distribute that negative.

4.3a^2 + 1.6a − 4.3 − 2.7a^2 + 3.3a + 11.8

add/subtract together the a^2's, then add/subtract the a's, and add subtract the plain numbers.

whatever you have left, assemble together and that's your answer!

Answer 2

4.3a^2 + 1.6a − 4.3 − 2.7a^2 + 3.3a - 11.8

**it should be like this, not what i have written in the other post.

Answer 3

7a^2 + -1.7a - -7.5?

Answer 4

Not quite. You can write it a different way to make it more simple:

(4.3a^2 - 2.7a^2) + (1.6a + 3.3a) + (-4.3 - 11.8)

add/subtract the a^2, the a, and the constants.

make sure to watch out for positive/negative signs

Answer 5

If you don't want to deal with the decimals, you could multiply everything by 10. Then you would have:

(43a^2 - 27a^2) + (16a + 33a) + (-43 - 118)

which is a bit easier to visualize

Answer 6

1.6a^2 + 4.9a + 7.5?

Answer 7

very close. everything except the 7.5 is right. look at it a bit more closely:

-4.3 - 11.8, or -43 - 118

it isn't 118 - 43, and it isn't -43 + 118

Both numbers are negative. Another way to think about it:

-43 + -118

well, 43 + 118 is 161. But it's negative so -161

And it's a decimal too, so it's -16.1

Answer 8

check my answer for this one?
(8a2 − 4a) + (−5a2 + 6a + 2)
i got 3a^2 + 2a + 2
is that right?

Answer 9

@funinabox ?

Answer 10

sorry internet is going very slow, or this website is.
your answer is correct.

Answer 11

thanks for the help