Question

已知a,b,c是常数,且(ax-1)(x+b)=2x平方+x+c.求a,b,c的值

Answer 1

ax^2 abx-x-b=2x^2 x cax^2 (ab-1)x-b=2x^2 x c所以a=2,ab-1=1,b=1,c=-b=-1