Question

(a5+2a4-a3):(-a3)+(a-1)(a+1)

Answer 1

$= a^{3} ( a^{2}+2a-1 ):(- a^{3} )+(a-1)(a+1)= - ( a^{2}+2a-1 )+(a-1)(a+1)= =- a^{2}-2a+1+ a^{2} -1=-2a$