Can someone me in this?
a^2-ab-b-1

(a + 1) (a − b − 1)

Step-by-step explanation:

I assume you're trying to factor the expression?  If so, use quadratic formula to find the roots.

a = [ -(-b) ± √((-b)² − 4(1)(-b−1)) ] / 2(1)

a = [ b ± √(b² + 4b + 4) ] / 2

a = [ b ± (b + 2) ] / 2

a = -1 or b + 1

(a − (-1)) (a − (b + 1))

(a + 1) (a − b − 1)