x²-6x+8=0x²-6x+9=1(x-3)²=1x-3=±1x1=4,x2=22x²+10x=-9/4x²+5x=-9/8x²+5x+(5/2)²=(5/2)²-9/8(x+5/2)²=25/4-9/8(x+5/2)²=41/8x+5/2=-5/2±√(41/8)x1=-5/2+√(41...