Algebraic Techniques, SMB-060 Expand and simplify the expression `(a+b)^2-(a-b)^2` (2 marks) Show Answers Only `4ab` Show Worked Solution `(a+b)^2-(a-b)^2` `=a^2+2ab+b^2-(a^2-2ab+b^2)` `=a^2+2ab+b^2-a^2+2ab-b^2` `=4ab`