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प्रश्न
Multiply: (2x + 3y)(2x - 3y)
उत्तर
(2x + 3y)(2x - 3y)
⇒ 2x (2x - 3y) + 3y(2x - 3y)
⇒ 2x × 2x - 2x × 3y + 3y × 2x - 3y × 3y
⇒ 4x2 - 6xy + 6xy - 9y2
⇒ 4x2 - 0 - 9y2
⇒ 4x2 - 9y2
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