How do i make this a product?

i tried solving it, but i ended up getting the incorrect answer. here’s what i did:

a-b+a^2-b^2
(a-b)+(a-b)(a+b)
2(a-b)(a+b)

what did i do wrong?

What you did wrong:

(a-b)+(a-b)(a+b)=(a-b)+(a-b)(n)

so the terms can't be combined, like 4+4n wouldn't make 8n

What you should do:

a-b+a²-b²

a²+a-b²-b

(a+b+1)(a-b)

answer: b

step-by-step explanation:

the correct answer would be d because the slope is -2/2=1 and the y intercept is at 2 so that is the correction equation