Simplify by Using Formula : (X + Y - 3) (X + Y + 3) - Mathematics

Simplify by using formula :
(x + y - 3) (x + y + 3)

Sum

(x + y - 3) (x + y + 3)
= (x + y)² - (3)²
= x² + y² + 2xy - 9
(Using identity : (a + b)(a - b) = a² - b²).

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Chapter 4: Expansions - Exercise 4.1

Chapter 4 Expansions
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