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प्रश्न
Multiply: (-2x + 3y)(2x - 3y)
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उत्तर
(- 2x + 3y)(2x - 3y)
⇒ - 2x (2x - 3y) + 3y(2x - 3y)
⇒ - 4x2 + 6xy + 6xy - 9y2
⇒ - 4x2 + 12xy - 9y2
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