(1)(3y-2)²-5(3y-2)=14 (2)(x+6)(x-7)=14
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(1)(3y-2)²-5(3y-2)=14(2)(x+6)(x-7)=14(1)(3y-2)²-5(3y-2)=14(2)(x+6)(x-7)=14(1)(3y-2)²-
(1)(3y-2)²-5(3y-2)=14 (2)(x+6)(x-7)=14
(1)(3y-2)²-5(3y-2)=14
(2)(x+6)(x-7)=14
(1)(3y-2)²-5(3y-2)=14 (2)(x+6)(x-7)=14
1)(3y-2)²-5(3y-2)=14
9y^2-12y+4-15y+10=14
9y^2-27y=0
9y(y-3)=0
y=0 y=3
(2)(x+6)(x-7)=14
x^2-x-42=14
x^2-x-56=0
(x-8)(x+7)=0
x=8 x=-7
http://blog.sina.com.cn/u/1235853792
(1)9Y²-12Y+4-15Y+10=14
9Y²-27Y=0
Y(9Y-27)=0
Y1=0 Y2=3
(2) X²-X-42=14
X²-X-56=0
(X+7)(X-8)=0
X1=-7 X2=8
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