Question

用适当的方法解方程.明天就要去学了,

Answer 1

⑴(2X-1)^2=64,

2X-1=±8,

X1=9/2,X2=-7/2.

⑵X^2+4X=-1

X^2+4X+4=3

(X+2)^2=3

X=-2±√3.

⑶6X^2-5X-1=0

(6X+1)(X-1)=0

X1=-1/6,X2=1.

⑷X^2-3X-4=0

(X-4)(X+1)=0,

X1=4,X2=-1.