2次方程式の解が1桁の重解

$x^2-2x+1=0$	$(x-1)^2=0$	$x=1$	$x^2+2x+1=0$	$(x+1)^2=0$	$x=-1$
$x^2-4x+4=0$	$(x-2)^2=0$	$x=2$	$x^2+4x+4=0$	$(x+2)^2=0$	$x=-2$
$x^2-6x+9=0$	$(x-3)^2=0$	$x=3$	$x^2+6x+9=0$	$(x+3)^2=0$	$x=-3$
$x^2-8x+16=0$	$(x-4)^2=0$	$x=4$	$x^2+8x+16=0$	$(x+4)^2=0$	$x=-4$
$x^2-10x+25=0$	$(x-5)^2=0$	$x=5$	$x^2+10x+25=0$	$(x+5)^2=0$	$x=-5$
$x^2-12x+36=0$	$(x-6)^2=0$	$x=6$	$x^2+12x+36=0$	$(x+6)^2=0$	$x=-6$
$x^2-14x+49=0$	$(x-7)^2=0$	$x=7$	$x^2+14x+49=0$	$(x+7)^2=0$	$x=-7$
$x^2-16x+64=0$	$(x-8)^2=0$	$x=8$	$x^2+16x+64=0$	$(x+8)^2=0$	$x=-8$
$x^2-18x+81=0$	$(x-9)^2=0$	$x=9$	$x^2+18x+81=0$	$(x+9)^2=0$	$x=-9$
$x^2-20x+100=0$	$(x-10)^2=0$	$x=10$	$x^2+20x+100=0$	$(x+10)^2=0$	$x=-10$
$x^2-22x+121=0$	$(x-11)^2=0$	$x=11$	$x^2+22x+121=0$	$(x+11)^2=0$	$x=-11$
$x^2-24x+144=0$	$(x-12)^2=0$	$x=12$	$x^2+24x+144=0$	$(x+12)^2=0$	$x=-12$
$x^2-26x+169=0$	$(x-13)^2=0$	$x=13$	$x^2+26x+169=0$	$(x+13)^2=0$	$x=-13$
$x^2-28x+196=0$	$(x-14)^2=0$	$x=14$	$x^2+28x+196=0$	$(x+14)^2=0$	$x=-14$
$x^2-30x+225=0$	$(x-15)^2=0$	$x=15$	$x^2+30x+225=0$	$(x+15)^2=0$	$x=-15$
$x^2-32x+256=0$	$(x-16)^2=0$	$x=16$	$x^2+32x+256=0$	$(x+16)^2=0$	$x=-16$
$x^2-34x+289=0$	$(x-17)^2=0$	$x=17$	$x^2+34x+289=0$	$(x+17)^2=0$	$x=-17$
$x^2-36x+324=0$	$(x-18)^2=0$	$x=18$	$x^2+36x+324=0$	$(x+18)^2=0$	$x=-18$
$x^2-38x+361=0$	$(x-19)^2=0$	$x=19$	$x^2+38x+361=0$	$(x+19)^2=0$	$x=-19$