Question

解方程：⑴ 2y²=8 ⑵ 2（x-8）²=50 ⑶ （2x-1）²

Answer 1

（1）y=2或y=-2

(2)x=13或x=3

(3)x=3/2或x=-1/2

(4)x=1/2(或0.5）

（5)x=√2+1或x=-√2+1

(6)x=-√5+2或x=√5+2

(7)x=(2√2)/3或x=-(2√2)/3

(8)x=-3或x=-9

(9)x=1/3或x=-1