(x-1)(x+5) =x²+5x-x-5 =x²+4x-5 對應多項式x²+px+q得知 p=4 , q=-5 則p+q=4+(-5)=-1
此題答案應改為(A) -1
x2 + px + q = (X-1)(X+5)將X帶入1,可得到1+P+Q = 0P+Q= -1
7.若多項式x2 + px + q可因式分解為(x -1)(x +5),則p ..-阿摩線上測驗