Question

(-4a^2+2a+2)-(7a^2+2)
=-12a^2+2a+4?

Answer 1

-4a^2 + 2a + 2 - 7a^2 - 2
= -11a^2 + 2a

Answer 2

-11a^2 +2a +4

Answer 3

Where do you get +4?

Answer 4

when i added the +2 n +2

Answer 5

That is 2 - 2 = 0. The minus before (7a^2+2) applies to both terms.

Answer 6

what happens to the 2a?

Answer 7

(-11a^2 +2a + 2) - (7a^2 -2) In the second term you need to distribute the negative.
(-11a^2 +2a +2) + (-7a^2 +2) bring the negative into the second set of brackets
Now group like terms

-11a^2 -7a^2 + 2a +2 +2

Answer 8

2a stays. That is why the answer is -11a^2 + 2a.

Answer 9

ok i think i got it lol

Answer 10

Absolutely 2a stays, it's a seperate term that is different than all the others, you have three terms that you are working with here, "a squared", "a", and the "constant" at the end (no variable attached to it, it's just a number by itself).

When you group like terms, you bring all the same terms together then add or subtract them to get your final answer.