____________________________
<span>(a^9-a^6+a^4):(-a^2)+(a+3)(a-3) =
a^2 * (a^7 - a^4 + a^2)
= ------------------------------- + a</span>^2 - 9 = a^2 - 9 - a^7 + a^4 - a^2 = <span>
-1 * a^2
= a^4 - a^7 - 9 = (-1)^4 - (-1)^7 - 9 = 1 + 1 - 9 = -7</span>