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(x+4)(x-4)=0
x+4=0, x-4=0
4
-4
$y_1=0,$$ y_2=1$
$x_1=0,$$ x_2=2$
D
解:$x(x - 2) = 0,$$x_1 = 0,$$x_2 = 2$
解:$y(y + 3) = 0,$$y_1 = 0,$$y_2 = -3$
解:$(x - 1)(x + 1) = 0,$$x_1 = 1,$$x_2 = -1$
解:$(x + 2)(x - 2) = 0,$$x_1 = -2,$$x_2 = 2$
解:$(x - 2)(x - 3) = 0,$$x_1 = 2,$$x_2 = 3$
解:$3x(x - 2) = 0,$$x_1 = 0,$$x_2 = 2$
解:$x^2 - 6x + 9 = 0,$即$(x - 3)^2 = 0,$解得$x_1 = x_2 = 3$
解:$(x - 3)^2 + 2x(x - 3) = 0,$提取公因式$(x - 3)$得$(x - 3)(x - 3 + 2x) = 0,$即$(x - 3)(3x - 3) = 0,$解得$x_1 = 3,$$x_2 = 1$
解:$-3x^2 + 6x - 3 = 0,$方程两边同时除以$-3$得$x^2 - 2x + 1 = 0,$即$(x - 1)^2 = 0,$解得$x_1 = x_2 = 1$
解:$(5x - 1)^2 = 3(5x - 1),$移项得$(5x - 1)^2 - 3(5x - 1) = 0,$提取公因式$(5x - 1)$得$(5x - 1)(5x - 1 - 3) = 0,$即$(5x - 1)(5x - 4) = 0,$解得$x_1 = \frac{1}{5},$$x_2 = \frac{4}{5}$
解:(x-3)²=0
$ x_1=x_2=3$
解:(x-3)(3x-3)=0
$ x_1=3,$$ x_2=1$
解:(x-1)²=0
$ x_1=x_2=1$
解:(5x-1)(5x-4)=0
$ x_1=\frac {1}{5},$$ x_2=\frac {4}{5}$