Question

若3am-1的次方bn+3的次方与5a3的次方b2n+1的次方是同类项,求(m+n)(-n)的值

Answer 1

m-1=3

n+3=2n+1

∴m=4

n=2

∴(m+n)(-n)

=(4+2)(-2)

=-8