1)a*b+0*0=ab+0=ab
2)a*0+0*b=0+0=0
3)a*a+b*b=a^2+b^2
4)a*-a+b*-b=-a^2-b^2
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1)a*b+0*0=ab+0=ab
2)a*0+0*b=0+0=0
3)a*a+b*b=a^2+b^2
4)a*-a+b*-b=-a^2-b^2