1st Remarkable Identity

Lesson 2
Remarkable Identities




1^st Identity: Square of a Sum
(a + b)² = a² + 2ab + b²

1^st Identity: Square of a Sum
(a + b)² = a² + 2ab + b²

Watch the video for a Geometric Proof:

Multiple Choice

(a + b)² is a:

• Square of two differences

• Square of a sum

• Square of a difference

Multiple Choice

The expanded form of (a + b)² is:

• a² + ab + b²

• a² + b²

• a² + 2ab + b²

Multiple Choice

The expanded form of (x + 4)² is:

• x² + 4x + 4

• x² + 8x + 16

• x² + 2x + 16