Question

answer it with full formula ​

Answer 1

Step-by-step explanation:

${a}^{2} + {b}^{2} - 2ab - ( {a}^{2} + {b}^{2} + 2ab) \\ {a}^{2} + {b}^{2} - 2ab - {a}^{2} - {b}^{2} - 2ab \\ - 4ab$