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2.4_Algebra_Properties_and_Proofs

2.4_Algebra_Properties_and_Proofs - 2.4 PROPERTIES AND...

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2.4 PROPERTIES AND PROOFS IN ALGEBRA
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Euclid the father of geometry •wrote “The Elements” about 300 BC a book of 13 chapters which we use today for our definitions and postulates and theorems
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PROOFS
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Given: 2x + 3 = 11 Prove: x = 4 2x + 3 = 11 3 = 3 2x = 8 2 = 2 x = 4 1. 5. 3. subtraction prop. 3. 1. given 5. division prop. statements reasons 2. 4. 2. reflexive 4. reflexive
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