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00:00 - 00:59 | the question is let Star operation of Z Defined by a star is equal to a star b is equal to a plus b minus 4 all ab belongs to show that star is both commutative and associative so here we have to prove that star is both committee and associated so here let us discuss the first that what is our community based RB hsta b is equal to b y then it is our competitive so in this question latest 1 hour left hand side rear left hand side is our a star B and this is equal to a plus b minus 4 B have a plus b minus of now take our RSS now take our RSS show d star Sohail |

01:00 - 01:59 | replace a with PNB with a b + A minus 4.1 and this is the point to do if you look close and point 1 is equal to 2.2 and that means h a star b is equal to 20 tarikh and this implies that it is a commutative it is a commutative now next to find the associated to hear what letter discuss what is a capacitive so hair if have a star star star 20 hour singer lineman can't see is other element is equal to a b l a b c is a single element and a is other single element to hear latest 1 hour left hand side rear left inside a |

02:00 - 02:59 | and a star be their first this is a star b star and is equal to a plus b minus 4 star see this is equal to our A plus B minus 4 hair will put a is equal to a kya be so and T is our see you here we have a plus b minus 4 + c minus 4 is ultimately is equal to a + b + c minus of it so let's point number 3rd now next will find RSS RSS and RHS is a star post so here we have a star star star is a single element and studies other element so here it is equal to |

03:00 - 03:59 | a star C into B + c minus 4 so yeah well put a star restaurant b star be as our we have a + b + c minus 4 - 4 so here we have a + b + c minus at 8 and this is equal to a star be start seeing baby starts a single element to let se disappoint number 4 so here we can see that our point the 4 is equal to point number 3 and this implies that our a star be star is equal to a star star song from where we can see that it is a associative and we were asked to |

04:00 - 04:59 | that that both is commutative and associative so here we prove that it is a commutative and as well as our associative and this is our answer thank you |