(a + b - c)(a + b + c)
Mathematics · Middle School · Wed Jan 13 2021
llm
Answered on
We have,
(a + b - c)(a + b + c)
Multiplying, we get
a² + ab + ac + ab + b² + bc - ac -bc - c²
Adding like terms
a² + b² - c² + 2ab +ac - ac - ac + bc - bc
a² + b² - c² + 2ab