Question

m的二次方减1等于0,那m的三次方加二乘m的二次方加2等于多少 要具体算式!

Answer 1

m^2-1=0
m^2=1
m=+1或-1
(i)m=1:
m^3+2m^2+2=1+2+2=5
(ii)m=-1:
m^3+2m^2+2=-1+2+2=3