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(3﹣x)(3+x) (x﹣3)(x+3) (3﹣x)2 (3+x)2
x1=10,x2=2 x1=12,x2=10 x1=12,x2=2 x1=2,x2=2
x3+2ax2-a3 x3-a3 x3+2a2x-a3 x3+2ax2+2a2-a3
x1=10,x2=2 x1=12,x2=10 x1=12,x2=2 x1=2,x2=2
2x2+x﹣3 2x2﹣x﹣3 2x2﹣x+3 x2﹣2x﹣3
x1=10,x2=2 x1=12,x2=10 x1=12,x2=2 x1=2,x2=2
x1=10,x2=2 x1=12,x2=10 x1=12,x2=2 x1=2,x2=2
x1=10,x2=2 x1=12,x2=10 x1=12,x2=2 x1:2,x2=2