(x-1)x =42 解方程

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(x-1)x=42解方程(x-1)x=42解方程(x-1)x=42解方程(x-1)x=42(X-7)(X+6)=0X1=7,X2=-6(x-1)x=42x²-x-42=0(x-7)(x+6)

(x-1)x =42 解方程
(x-1)x =42 解方程

(x-1)x =42 解方程
(x-1)x =42
(X-7)(X+6)=0
X1=7,X2=-6

(x-1)x =42
x²-x-42=0
(x-7)(x+6)=0
x1=7, x2=-6

(x-1)x =42
(X+6)(X-7)=0
X1=-6,X2=7

(x-1)x =42
x²-x-42=0
(x-7)(x+6)=0
x1=7, x2=-6