a.0 = 0
1. 1+0=1 //assume
2. a(1+0)=a.1 //1 multiply by a
3. a.1+a.0=a.1 //2 distributive law
4. a+a.0=a //3 multiplicative identity
5. a+(-a)+a.0=a+(-a) // add -a to 4
6. 0+a.0=0 //by 5 additive inverse
7. a.0=0 //by 6 additive identity
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