How to Expand Algebraic Identities

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SUMMARY

The discussion focuses on expanding algebraic identities, specifically the expression $$(w+x)(y+z)$$ and its application in further expansions. Participants emphasize the importance of expanding the right-hand side first to identify cancellations that simplify the expression. The identities mentioned include $(m + n)² = m² + 2mn + n²$ and the distributive property applied to multiple variables. The approach of multiplying out the brackets is highlighted as a reliable method for verifying equivalence between the left-hand side and right-hand side of an equation.

PREREQUISITES
  • Understanding of basic algebraic identities
  • Familiarity with the distributive property
  • Knowledge of polynomial expansion techniques
  • Ability to manipulate algebraic expressions
NEXT STEPS
  • Study polynomial expansion methods in detail
  • Learn about the properties of algebraic identities
  • Practice solving problems involving the distributive property
  • Explore advanced algebraic techniques such as factoring and simplifying expressions
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Students, educators, and anyone looking to enhance their understanding of algebraic identities and polynomial expansions.

NotaMathPerson
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Hello! Please help me start solving this.

View attachment 5567

I did expand the lhs but I still can't make it to be like the rhs. Any help would be appreciated!
 

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There may be neater ways to do this, but you can't go wrong if you simply multiply out the brackets on both sides and see whether they give the same answer.
 
Hint: expand the right-hand side, first. You'll find some stuff "cancels".
 
According to Opalg, you probably know (m + n)² = m² + 2mn + n².
Also, $$(w+x)(y+z)=wy+xy+wz+xz$$.
Therefore, $$(wy+xy+wz+xz)(\alpha+\beta)=\alpha wy+\alpha xy+\alpha wz+\alpha xz+\beta wy+\beta xy+\beta wz+\beta xz$$.
 

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