Question

用因式分解法解下列方程：X²-3X-4=0 （2X-1)(X-1)=3

Answer 1

X²-3X-4=0

(x-4)(x+1)=0

x-4=0 x=4

x+1=0 x=-1

（2X-1)(X-1)=3

2x^2-3x+1=3

2x^2-3x-2=0

(2x+1)(x-2)=0

2x+1=0 x=-1/2

x-2=0 x=2