Step-by-step explanation:
Bringing like terms on one side
a2 - 2 = - 8a + 7a
a2 - 2 = - a
a2 + a - 2
a2 +2a - a - 2
a(a + 2) - 1 (a + 2)
(a + 2) and (a - 1)are the factors
