← Back to the lesson: Formulae (a+b)², (a−b)², a²−b²

Practice: Formulae (a+b)², (a−b)², a²−b²

All the questions sit under each other, like on paper. Where you can tap (signs, yes/no, shapes), tap — do not hunt for a keyboard. Otherwise write the answer and press the tick, or Check all at the bottom. Green = right. Red = not yet. Bắt đầu with ten. When it goes well, add more.

← Back to the explanation Next lesson: Equations: scales in balance →