因式分解法解方程(x-3)~2=49(x+2)~2

问题描述:

因式分解法解方程(x-3)~2=49(x+2)~2

(x-3)~2=49(x+2)~2
(x-3)²-49(x+2)²=0
[(x-3)+7(x+2)][(x-3)-7(x+2)]=0
(x-3+7x+14)(x-3-7x-14)=0
(8x+11)(-6x-17)=0
x=-11/8,或x=-17/6

(x-3)²=49(x+2)²
(x-3)²=7²(x+2)²
(x-3)²=[7(x+2)]²
(x-3)²=(7x+14)²
x-3=7x+14,解得x=-17/6
x-3=-(7x+14)解得x=-11/6

是这个吗
(x-3)²=49(x+2)²
(x-3)²-49(x+2)²=0
[(x-3)-7(x+2)][(x-3)+7(x+2)]=0
(-6x-17)(8x+11)=0
∴x=-17/6
或x=-11/8