解方程:(1)(x+2) 2 -25=0(2)x 2 -8x-16=

解方程:(1)(x+2) 2 -25=0(2)x 2 -8x-16=0
2025-06-20 07:20:51
推荐回答(1个)
回答1:

(1)(x+2) 2 =25,
x+2=±5,
即x+2=5或x+2=-5,
解得:x 1 =3,x 2 =-7;

(2)(x-4) 2 -16-16=0,
(x-4) 2 =32
x-4=±4
2

x-4=4
2
x-4=-4
2

解得: x 1 =4
2
+4
x 2 =-4
2
+4