Problem: Square sum of three terms
Problem
Find an expression for \({\left( a+b+c \right)}^2\) . Hint: write \(d=a+b\) such that \({\left( a+b+c \right)}^2={\left( d+c \right)}^2\) . Now use Product of sums, 5, … several times.
Solution
Problem
Find an expression for \({\left( a+b+c \right)}^2\) . Hint: write \(d=a+b\) such that \({\left( a+b+c \right)}^2={\left( d+c \right)}^2\) . Now use Product of sums, 5, … several times.
Solution